impression,picture,portrait,description?

[vaok]

A cute little female about six inches high,with wings and a preety dress is the usual ____
people give if you ask them what a fairy looks like.

A. impression B. picture C. portrait D. descripition.

I guess C is right? But I'm not sure. what's the differences? thanks.

[thod00]

I would go for D.

You can look up the words in a dictionary.