In 1974, the price of petrol in Britain rose by 120 percent; cars became expensive to run and train and bus fares increased. People who hadn't used a bicycle since they were children decided that they would buy bicycles.They discovered that cycling could be enjoyable and cheap. Bicycle sales had been falling for many years but suddenly everything changed.In 1975, British people spent more than one million on bicycles. Bicycle traffic increased by 11 percent. Bicycle fans compare the cost of running a car with the cost of running a bicycle.They also say bicycle-riding is a good form of exercise.In towns bicycles can often be faster than cars or buses.The bicyclists can ride through traffic jams and at the end of his journey he doesn't have to look for a parking space.Cycling through the countryside is a real pleasure; the cyclist has time to see things that the motorist, driving at over 100 kilometers an hour, never sees. But in the cities, cycling can be dangerous.You need good concentration and strong nerves, especially when a truck or a bus is trying to pass you.Since cycling became popular again, there has been an increase in the number of accidents. Cyclists say the answer to the problem is to separate bicycles from other traffic.Stevenage, a new town near London, has a system of "bikeways", where only bicycles are allowed to travel.However, in most towns, cyclists say, the needs of the bicycle riders are overlooked.Cyclists have formed into "action groups" in many towns in Britain.They want to persuade local councils-who are in charge of the roads and traffic in their areas-to make sure there are safe facilities for cyclists.Or, they say, interest in cycling will die. Today the Britain want to ride bikes because   _  .
trains and buses are too crowded the cost of riding bikes is much cheaper than that of taking trains or buses there are a lot of thieves on the trains or in the buses the traffic accidents easily happen while people go to work by train or by bus
Question: In 1974, the price of petrol in Britain rose by 120 percent; cars became expensive to run and train and bus fares increased. People who hadn't used a bicycle since they were children decided that they would buy bicycles.They discovered that cycling could be enjoyable and cheap. Bicycle sales had been falling for many years but suddenly everything changed.In 1975, British people spent more than one million on bicycles. Bicycle traffic increased by 11 percent. Bicycle fans compare the cost of running a car with the cost of running a bicycle.They also say bicycle-riding is a good form of exercise.In towns bicycles can often be faster than cars or buses.The bicyclists can ride through traffic jams and at the end of his journey he doesn't have to look for a parking space.Cycling through the countryside is a real pleasure; the cyclist has time to see things that the motorist, driving at over 100 kilometers an hour, never sees. But in the cities, cycling can be dangerous.You need good concentration and strong nerves, especially when a truck or a bus is trying to pass you.Since cycling became popular again, there has been an increase in the number of accidents. Cyclists say the answer to the problem is to separate bicycles from other traffic.Stevenage, a new town near London, has a system of "bikeways", where only bicycles are allowed to travel.However, in most towns, cyclists say, the needs of the bicycle riders are overlooked.Cyclists have formed into "action groups" in many towns in Britain.They want to persuade local councils-who are in charge of the roads and traffic in their areas-to make sure there are safe facilities for cyclists.Or, they say, interest in cycling will die. Today the Britain want to ride bikes because   _  .
A. trains and buses are too crowded
B. the cost of riding bikes is much cheaper than that of taking trains or buses
C. there are a lot of thieves on the trains or in the buses
D. the traffic accidents easily happen while people go to work by train or by bus
Answer: