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.
He works harder. He earns a lot of money.
A.Earning a lot of money, he works harder.
B.The less money he earns, the harder he works.
C.He earns less money when he works harder.
D.The harder he works, the more money he earns.