请问885section21-5

By the mid-seventeenth century, Amsterdam had built a new town hall so large that only St. Peter’s in Rome, the Escorial in Spain, and the Palazza Ducale in Venice could rival it for scale or magnificence.

(A) could rival it for

(B) were the rivals of it in their

(C) were its rival as to

(D) could be its rivals in their

(E) were rivaling its

答案是a, d为什么不对？不能用rival的名词意思来表示吗？谢谢

1. 动词的表达比名词好

2. 这里的their多余, 造成竞争rival上, Amsterdam去跟their scaleor magnificence比, 逻辑怪异