Lucille Has Been Sticking to a Strict Diet but Can't

Multiple Choice

Lucille has been sticking to a strict diet but can't seem to lose weight. What is the most likely explanation for her difficulty?

A) Her body has a very low set point.
B) Her pre-diet weight was near her body's set point.
C) Her weight problem is actually caused by an underlying eating disorder.
D) Lucille is influenced primarily by external factors.