求助大全885sec03-07

7.    Many investors base their choice between bonds and stocks on comparing bond yields to the dividends available on common stocks.

(A) between bonds and stocks on comparing bond yields to

(B) among bonds and stocks on comparisons of bond yields to

(C) between bonds and stocks on comparisons of bond yields with

(D) among bonds and stocks on comparing bond yields and

(E) between bonds and stocks on comparing bond yields with

答案选c，e为什么不对呢，为什么comparisons of 优于comparing呢，请大家指教，谢谢