Select the most appropriate meaning of the given Idiom:-

Finding your feet 

Become confident or successful

The most appropriate meaning of the idiom "finding your feet" is to become confident or successful. The idiom comes from the idea of a baby learning to walk, and how they need to find their balance before they can walk confidently. In a figurative sense, to say that someone is "finding their feet" means that they are becoming more confident and successful in a new situation.

The other options are not as accurate descriptions of the meaning of the idiom. Standing strongly is not the same as finding your feet. To be able to do something is not the same as finding your feet. Deteriorate rapidly is not typically associated with the idiom "finding your feet."