Monique Manipulates Self-Esteem to Be Either High, Moderate, or Low

Multiple Choice

Monique manipulates self-esteem to be either high, moderate, or low. She finds that performance is significantly better at moderate levels of self-esteem than it is at either high or low levels. Monique has found an example of

A) a linear relationship.
B) two independent variables.
C) a curvilinear relationship.
D) a scatter relationship.