问题详情

The vehicle sales were greatly cut down because
A．the car manufacturers were concerned about the American economy.
B．the market"s performance was found to be the worst in 50 years.
C．the prices of fuel rose to a level which was last seen in the 1950s.
D．the fuel prices were so high and the economy was facing a depression.请帮忙给出正确答案和分析，谢谢！