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 and 1981

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

agreed

the pronoun it refers to a noun coin, which is only available in A

C and D are incorrect because they change the meaning to say that 857 million coins were unpopular - the rest of the coins were popular...

update: I guess I was just repeating bigoyal's words...

In A, the subject is "the coin" - the coin proved unpopular because it looked.....

Whereas in option E, the subject is "which" referring to "dollars" - ....dollars, which proved unpopular because it looked.....
_________________

ISB 2011-12 thread | Ask ISB Alumni @ ThinkISB
All information related to Indian candidates and B-schools | Indian B-schools accepting GMAT scores
Self evaluation for Why MBA?

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 - Correct
(B) About 857 million silver-colored "Susan B. Anthony" dollars were minted as coins in the United States between 1979 and 1981 but - subject-verb agreement -- singular it to refer to dollars
(C) About 857 million silver-colored "Susan B. Anthony" dollars that were minted between 1979 and 1981 in the United States- subject-verb agreement -- singular it to refer to dollars
(D) About 857 million silver-colored "Susan B. Anthony" dollars that the United States minted between 1979 and 1981 - subject-verb agreement -- singular it to refer to dollars
(E) Between 1979 and 1981 the United States minted about 857 million silver-colored "Susan B. Anthony" dollars, which- subject-verb agreement -- singular it to refer to dollars

Answer A
_________________

When everything seems to be going against you, remember that the airplane takes off against the wind, not with it. - Henry Ford
The Moment You Think About Giving Up, Think Of The Reason Why You Held On So Long
+1 Kudos if you find this post helpful