[求助] GWD 27-1 ( 找不到討論貼, 請進來看看!! )

Q1

The United States minted about 857 million silver-colored "Susan B. 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 B. Anthony" dollars between 1979 and 1981, but the coin

B. About 857 million silver-colored "Susan B. Anthony" dollars were minted as coins in the United States between 1979 and 1981 but

C. About 857 million silver-colored "Susan B. Anthony" dollars that were minted between 1979 and 1981 in the United States

D. About 857 million silver-colored "Susan B. Anthony" dollars that the United States minted between 1979 and1981

E. Between 1979 and 1981 the United States minted about 857 million silver-colored "Susan B. Anthony" dollars, which

Answer is E.  Why not A ?

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The United States minted about 857 million silver-colored "Susan B. 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 B. Anthony" dollars between 1979 and 1981, but the coin

B. About 857 million silver-colored "Susan B. Anthony" dollars were minted as coins in the United States between 1979 and 1981 but

C. About 857 million silver-colored "Susan B. Anthony" dollars that were minted between 1979 and 1981 in the United States

D. About 857 million silver-colored "Susan B. Anthony" dollars that the United States minted between 1979 and1981

E. Between 1979 and 1981 the United States minted about 857 million silver-colored "Susan B. Anthony" dollars, which

A is the best answer.

B、C、D、E，句子后半部的it没有单数的指代对象