People experience when their basic needs are threatened?

A) Relief

B) Aggression

C) Grief

D) Stress

True, using a pedometer can promote a physically active lifestyle.

Imma gonna say go with the very first answer (:

Behavioral science is the study of human behaviors and how they can be influenced.  by examining patterns in behavior as well as reactions, individuals with behavioral problems can be more adequately treated, resulting in greater mental health of our society/the public.

Answer labor;