What Is the Key Difference Between Self-Esteem and Self-Concept

What is the key difference between self-esteem and self-concept?

A) There is no difference and the terms may be used interchangeably.
B) Self-esteem is a descriptor of an aspect of one's self, while self-concept adds value to that descriptor.
C) Self-concept is a descriptor of an aspect of one's self, while self-esteem adds value to that descriptor.
D) Self-concept is a descriptor of an aspect of one's self, while self-esteem explains how one uses that aspect in daily life.