Correct option is C
- The bracketed part is a direct question inside quotation marks, so it must end with a question mark ?, not a full stop.
- The reporting verb asked correctly introduces a question.
- Option (c) correctly uses punctuation and keeps the sentence meaningful: comma before the quotation and a question mark inside the quotation.
- (a) No correction required is wrong because the punctuation inside quotes is incorrect (full stop used instead of question mark).
- (b) Uses asked us that, which is generally used for statements, not direct questions; it makes the structure unsuitable with direct speech.
- (d) Uses told which cannot correctly introduce a direct question in this form; also punctuation remains incorrect.