ECO-friendly technology was the hottest trend at the 39thTokyo Motor Show, which opened last Friday.     About 240 car manufacturers from 13 countries presented new models. Most were powered by hybrid ,fuel cell  and electrical systems. Carmakers are championing more environmentally models amid increasing oil prices and environmental concerns.    "It's now carmakers' social responsibility to protect the environment," said Mazda president Hisakazu Imaki.     Seventy-nine cars and motorcycles are being presented to the public for the first time, according to the Japan Automobile Manufacturers Association.    The organizing association said the biennial  show, due to end on November6,was sure to have a large impact on the automobile industry.     Manufacturers are currently competing in the shift from gasoline-run engines to hybrid, fuel cell or electricity-powered systems.     Mazda has a new sports vehicle, which runs on a hybrid electric-petrol system. It is also showing a gasoline-hydrogen run sports car.     A member of the Ford family, Mazda plans to market a hybrid version of the Tribute sport utility vehicle (SUV) next spring and enhance its co-operation with Ford in hybrid systems development. Honda's fuel cell sedan  on show uses a hydrogen-oxygen fuel. The system only sends water out its exhaust ,a better solution for the environment and less polluting than hybrids. At present, cars are generally powered by  _  .
electricity fuel cell gasoline or petrol solar cell
Question: ECO-friendly technology was the hottest trend at the 39thTokyo Motor Show, which opened last Friday.     About 240 car manufacturers from 13 countries presented new models. Most were powered by hybrid ,fuel cell  and electrical systems. Carmakers are championing more environmentally models amid increasing oil prices and environmental concerns.    "It's now carmakers' social responsibility to protect the environment," said Mazda president Hisakazu Imaki.     Seventy-nine cars and motorcycles are being presented to the public for the first time, according to the Japan Automobile Manufacturers Association.    The organizing association said the biennial  show, due to end on November6,was sure to have a large impact on the automobile industry.     Manufacturers are currently competing in the shift from gasoline-run engines to hybrid, fuel cell or electricity-powered systems.     Mazda has a new sports vehicle, which runs on a hybrid electric-petrol system. It is also showing a gasoline-hydrogen run sports car.     A member of the Ford family, Mazda plans to market a hybrid version of the Tribute sport utility vehicle (SUV) next spring and enhance its co-operation with Ford in hybrid systems development. Honda's fuel cell sedan  on show uses a hydrogen-oxygen fuel. The system only sends water out its exhaust ,a better solution for the environment and less polluting than hybrids. At present, cars are generally powered by  _  .
A. electricity
B. fuel cell
C. gasoline or petrol
D. solar cell
Answer: