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.
Dad's car is very old. He can't afford to buy a new one.
A.Dad's car is very old, but he can't afford to buy a new one.
B.Dad's car is very old, so he can't afford to buy a new one.
C.Dad can't afford to buy a new one just as his car is very old.
D.Dad's car is very old, though he can't afford to buy a new one.