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
His wife gave birth to their first child. He understood what true responsibility meant.
A. Never has he understood true responsibility before he became a parent himself
B. Were his first child not to be born, he wouldn’t understand true responsibility
C. Hardly had he understood true responsibility when their first child was born
D. Not until he became a parent did he understand what true responsibility meant