Tracy: Excuse me. I wonder if you could help me with this suitca

Tracy: Excuse me. I wonder if you could help me with this suitcase. I just want to put it on the top rack.
Robert: ________
A、OK, I don’t care.
B、Fine, I agree.
C、Sure, no problem.
D、Why don’t I?
【正确答案】：C
【题目解析】：对话大意：打扰一下，我在想你能帮我抬一下行李箱吗？我想把它放到最上一层，C项：当然，没问题，是最佳答句。