Read the passage.The suspect insisted the detectives were barking up the wrong tree. She explained that she’d been busy at the time of the crime. As a result, the suspect was annoyed when the detectives continued with the questioning anyway.

“Barking up the wrong tree” means pursuing the wrong person or idea. Since the suspect says she was busy at the time of the crime, the detectives should question a different suspect. Choice B, “question a different suspect,” best matches the idiom.

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