The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
Did the police / find out / who break into / your store?

Correct option is B

Option (b) contains an error.
Explanation: The verb "break" is in the present tense, which is incorrect in this sentence. Since the main verb is in the past (“Did the police...”), the clause must also be in the past tense. So, "break" should be changed to broke.
Grammatical rule used:
When the main clause is in past tense, the verb in the subordinate clause must agree with it in tense (unless it is a universal truth).
Correct Sentence: Did the police find out who broke into your store?
Example:
Incorrect – Did you know who plays the song?
Correct – Did you know who played the song?