Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
The Postal Service used the Roman god Mercury as its symbol. This was replaced in 1837 with a running pony.
A. The Postal Service, which used the Roman god Mercury as its symbol, was replaced in 1837 with a running pony.
B. The Postal Service used the Roman god Mercury as its symbol, which was replaced in
1837 with a running pony.
C. The Postal Service, that was replaced in 1837 with a running pony, used the Roman god Mercury as its symbol.
D. The Postal Service used a running pony as its symbol, which was replaced in 1837 with the Roman god Mercury