Dr.Tremblay is a clinical psychologist who notes that an unusually large number of depressed or anxious people tend to gain weight.She offers an explanation that the hormones associated with stress lead to changes in metabolism that cause weight gain.What is the term for her explanation

A)  a variable
B)  an educated opinion 
C)  a verifiable fact
D)  a theory

Hormones

Chemical messengers produced by the endocrine glands that regulate various bodily functions by traveling through the bloodstream to organs and tissues.

Metabolism

The set of life-sustaining chemical reactions in organisms, allowing for the growth, reproduction, maintenance of structures, and response to their environments.

Stress

A state of mental or emotional strain or tension resulting from adverse or demanding circumstances.