請教GWD-9-Q32:

[黃家大少]

The United States minted about 857 million silver-colored “Susan Anthony” dollars between 1979 and 1981, but the coin proved unpopular because it looked and felt too much like a quarter.
A. The United States minted about 857 million silver-colored “Susan Anthony” dollars between 1979 and 1981, but the coin
B. About 857 million silver-colored “Susan Anthony” dollars were minted as coins in the United States between 1979 and 1981 but
C. About 857 million silver-colored “Susan Anthony” dollars that were minted between 1979 and 1981 in the United States
D. About 857 million silver-colored “Susan Anthony” dollars that the United States minted between 1979 and 1981
E. Between 1979 and 1981 the United States minted about 857 million silver-colored “Susan Anthony” dollars, which

答案為A 想請教一下解題的思路

[A級垂耳兔]

答題關鍵在後面的it....
依代名詞優先代替原句主詞原則....
只有答案A單數
其他答案主詞都是dollars....全砍~~~