Question 31: Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions: I hadn’t understood (A) his directions; however (B), I asked him (C) to repeat what he’s said (D).
however => therefore
Based on the meaning of the two clauses, we see that not understanding the question leads to asking for repetition
=> the relationship here is cause and effect.
I didn’t understand his instructions, so I asked him to repeat what he said.