Select the word segment that can substitute the bracketed word segment correctly and complete the sentence.
The detective (had been solved the murder mystery) within a week.

Correct option is B

The correct substitution of the highlighted words is (b) solved the murder mystery.
Explanation: The verb “had been solved” is passive and incorrect since the detective is the subject/doer of the action. The sentence should be in active voice, simple past tense.
Correct sentence: The detective solved the murder mystery within a week.
Grammar Rule Used:
✔ Subject + V2 (past form) + object for active voice narration of completed actions.
�� Information Booster:
Avoid using passive structure (“had been + V3”) when the subject is actively doing the task.