General Motors Was Able to Gain Advantage Over Ford in the 1920s

General Motors was able to gain advantage over Ford in the 1920s primarily because:

A) the latter failed to adapt its product policy and organization structure to meet the demands of the changing market.
B) the former had always been an M-form and better managed organization.
C) the latter charged higher prices for its cars than General Motors.
D) the former was vertically integrated with better control over its input production than Ford.