Choose the most appropriate option to change the narration (direct / indirect) of the given sentence.
The airport helper said, “Should I fetch you a trolley?”

A

The helper had said he would be fetching me a trolley.

B

The airport helper is asking me that he will fetch a trolley.

C

The airport helper asked me if he should fetch me a trolley.

D

The airport helper said he will go to fetch me a trolley.