Though Nadine Is Not Overweight According to the Body Mass

Though Nadine is not overweight according to the Body Mass Index (BMI) ,she would like to be significantly thinner than she is.She successfully loses 15 pounds on a low-carb diet,but returns to her original weight as soon as she goes back to eating normally.A few months later,she begins a new job and gains eight pounds,but once she settles into a routine,she returns to her original weight.She believes her body is determined to keep her at her natural

A) metabolic utilization.
B) set point.
C) intrinsic motivation.
D) physiology.