The answer to the question given is:
<span>better mass production techniques
</span>Better mass production techniques BEST explains the increased totals for all cars made in the 1920s. Henry Ford, together with <span>General Motors and Chrysler emerging as the “Big Three” auto companies, </span> innovated mass-production techniques that became standard, by the 1920s.
C and a. 1111111111111111111111111111
The answer I think to this is C. Eisenhower
Hope this helps in anyway? and sorry if it's wrong.