Now we're always hearing about road accident, and when we're in a car we try to drive carefully, but how many of us take the same degree of care in our homes? Any large hospital will tell you the number of the accidents that happen in the home is almost the same as those on the road. One of the commonest and most dangerous causes of home accidents is wrong and careless use of electrical equipment. People will continue to use a loose plug or pull out a plug without first turning off the power. In spite of warnings, one will carry an electric heater into the bathroom when he is going to have a bath. Sometimes one forgets to cut off the power before mending a lamp or something else. All this will cause accidents. So the rule about anything that work by electricity is:Switch off before you touch anything and don't pretend you know when you actually don't. If you've got children in the house, it's always best to keep medicines of any kind out of their reach. Otherwise, they may be taken for candies or a new kind of drink. When there are older people living with you, you have to take particular care in a number of ways in order to make them safe and happy. Fire, of course, is always a risk. So, remember not to dry clothes in front of fires, or leave stoves in the middle of rooms where they can easily be knocked over. And don't forget to keep the children away from fire. Smoking, too, may cause fire. So you'd better give it up. Safety first may mean a little more time and care, but it may save you a lot of trouble. The main purpose of writing the text is   _  .
to tell how and why home accidents happen to persuade people to get rid of bad habits to explain how to use electrical equipment to instruct people how to prevent home accidents
Question: Now we're always hearing about road accident, and when we're in a car we try to drive carefully, but how many of us take the same degree of care in our homes? Any large hospital will tell you the number of the accidents that happen in the home is almost the same as those on the road. One of the commonest and most dangerous causes of home accidents is wrong and careless use of electrical equipment. People will continue to use a loose plug or pull out a plug without first turning off the power. In spite of warnings, one will carry an electric heater into the bathroom when he is going to have a bath. Sometimes one forgets to cut off the power before mending a lamp or something else. All this will cause accidents. So the rule about anything that work by electricity is:Switch off before you touch anything and don't pretend you know when you actually don't. If you've got children in the house, it's always best to keep medicines of any kind out of their reach. Otherwise, they may be taken for candies or a new kind of drink. When there are older people living with you, you have to take particular care in a number of ways in order to make them safe and happy. Fire, of course, is always a risk. So, remember not to dry clothes in front of fires, or leave stoves in the middle of rooms where they can easily be knocked over. And don't forget to keep the children away from fire. Smoking, too, may cause fire. So you'd better give it up. Safety first may mean a little more time and care, but it may save you a lot of trouble. The main purpose of writing the text is   _  .
A. to tell how and why home accidents happen
B. to persuade people to get rid of bad habits
C. to explain how to use electrical equipment
D. to instruct people how to prevent home accidents
Answer: