One possible explanation as to why individuals have differing set-points is

A) genetics.
B) past success or failure at diets.
C) ethnicity.
D) age.

Set-Points

The theory that each person's body has a predetermined or natural weight that it seeks to maintain through various physiological mechanisms.

Genetics

The study of heredity and the variation of inherited characteristics.

Ethnicity

Shared cultural practices, perspectives, and distinctions that set apart one group of people from another, based on heritage, language, religion, and social experiences.