Differentiate a Concept and a Category

Multiple Choice

Differentiate a concept and a category.

A) Categories are real-world classes of things,and concepts are the mental representations of them.
B) Concepts are real-world classes of things,and categories are the mental representations of them.
C) Categories only include those things which naturally exist,while concepts can represent anything.
D) Concepts only include those things which naturally exist,while categories can represent anything.