Explanation:

- (A) The officer asked the recruit:

This part of the sentence is grammatically correct. It sets the context for what follows by introducing the subjects and the action.

- (B) which district:

This part is correct and continues the question being asked by the officer, indicating the focus on location.

- (C) he came from:

This is where the error lies. The use of "came" is incorrect in this context. It should be "comes" to maintain proper tense consistency in the indirect question. The correct phrase should be "which district he comes from."

- (D) No error:

Your choice of 'No error' suggests that you found the sentence perfectly fine, but actually, it has an error in part (C).

Correct Answer: `Option:4`