Above suspicion means so honest or respectable that no one is likely to suspect wrongdoing. The correct answer is this meaning because the expression is used figuratively, not only by its literal words.

Examples:

• The auditor must be above suspicion.
• In an HSC essay, Above suspicion can express this meaning: so honest or respectable that no one is likely to suspect wrongdoing.
• When this expression appears in a passage, connect Above suspicion with the idea of so honest or respectable that no one is likely to suspect wrongdoing.