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.
Mr. Nam is very busy with his work at school. He still takes good care of his baby.
A.In spite of being very busy with his work at school, Mr. Nam takes good care of his baby.
B.Because Mr. Nam is very busy with his work at school, he takes good care of his baby.
C.Mr. Nam is so busy with his work at school that he cannot take good care of his baby.
D.Mr. Nam is too busy with his work at the office to take good care of his baby.