gmat_perfect wrote:In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost twice the numbers of trucks alone came off the assembly lines.

A. the numbers of tucks alone
numbers is wrong / it should be number without the s
B. that number of trucks alone
correct
C. the number of trucks by themselves
themselves is wrong in this sentence
D. as many trucks themselves
themselves is wrong in this sentence + as many --> wrong idiom
E. as many trucks by themselves
themselves is wrong in this sentence + as many --> wrong idiom

[spoiler]OA: Later[/spoiler]


Thanks for explanation of every option.