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.
There is an important difference between chimpanzees and humans. Humans walk on two legs.
A.There is an important difference between chimpanzees and humans that walk on two legs.
B.There are important differences between chimpanzees and humans that walk on two legs.
C.Humans walk on two legs, so they are importantly different from chimpanzees.
D.An important difference between chimpanzees and humans is that humans walk on two legs.

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