That which is the best example of treacherous behavior is: b. betraying someone's trust.
A treacherous behavior is an attitude that is deceitful. A treacherous person is cunning and not straightforward in his ways.
When a person betrays the trust of his fellow, he has engaged in treacherous behavior and this will make it difficult for others to trust him.
So, option B is an example of treacherous behavior.
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