[求助]BY-5-18

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

BY上说答案是B，但是B的时态看上去有问题。我认为应该选C，and后面是省略了was的并列句。大家认为如何？

另外：superiority后面应该加over还是to还是两个都可以呢？

相同主语后面的was才可以省略

and前面的主语是 usefulness of the motor car ,and后面的主语是its superiority  2个主语不同 不可省略