The idiom "A square peg in a round hole" means?

In a financial crisis

a misfit in the environment

unhappy and regretful

in a favourable situation

None of the above

The idiom "A square peg in a round hole" means غیر مناسب ماحول میں

For Example" She found herself a square peg in a round hole when she married a poor farmer and moved to a small village.