Mark the letter A, B, C, or D on...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
(A) Once you can (B) overcome your difficulty, the problem (C) may well become a source of (P) strengthen to your marriage and your faith

A. Once

B. overcome

C. may well become

D. strengthen