Sentence improvement (idiom and reflexive use): choose the option that best completes the idiom Original sentence: "I need not offer any explanation regarding this incident — my behaviour is speaking itself." Select the most natural and idiomatic completion.

Concept
The fixed idiom is “something speaks for itself,” meaning it is so clear that no further explanation is needed. English does not say “speaking itself/ about itself” here.

Option analysis
speaks for itself — correct idiom; concise and natural. ✅will speak to itself — wrong preposition and odd meaning.has been speaking — wrong aspect, and still missing the idiomatic “for itself”.speaks about itself — wrong preposition; changes meaning.

Final Answer
… my behaviour speaks for itself.