Once the economic and social usefulness of the motor car was demonstrated and with its superiority to the horse being proved, much of the early hostility to it in rural regions disappeared.
(A) and with its superiority to the horse being
(B) and its superiority over the horse had been
(C) and its superiority to the horse
(D) its superiority over the horse
(E) with its superiority to the horse having been
Guys, how can the answer be C. I know the official answer is C
But let us examine that choice.
Let us replace A = the economic and social usefulness of the motor car
B = its superiority to the horse
So with C, the sentence will become as follows:
Once A was demonstrated and B proved
, much of the early hostility to it in rural regions disappeared.
Does the bold part make sense? Had there been the word "was" at the end of the choice C, it woudl have been more appropriate.
Furthermore, I belive the correct idioms is "superior to", but when the noun "superiority" is used, I think the correct idiom should be "superiority over". I am very confident about this. Anyone with different thought please contend.
I would say that the answer should be B. Even B has its own problem. But C has a glaring deficiency as I explained above. Unless "was" is added at the end of choice C, I would select B.