The idiom "to fish in troubled waters" means:

Explanation

The idiom 'to fish in troubled waters' refers to the act of taking advantage of a difficult or chaotic situation for personal gain. This is illustrated in the correct option, which highlights the idea of making a profit during tough times. The other options misunderstand the idiom: Option A takes a literal view that misses the figurative meaning, Option C incorrectly suggests causing problems rather than benefiting from them, and Option D only addresses the hardships without recognizing the opportunity for gain that the idiom suggests.