One of the Reasons the American Automakers Lost So Much

One of the reasons the American automakers lost so much of the market share is:

A) American drivers substantially decreased their demand for cars, opting to travel by mass transportation instead.
B) American automakers focused their efforts on developing automobiles that use alternative sources of energy.
C) American automakers preferred to produce higher-priced cars and light trucks that had a higher profit margin.
D) American drivers' taste in cars changes dramatically from one year to the next, making product planning highly volatile.
E) American automakers concentrated on updating manufacturing equipment and could not maintain market share during the transition.