Treatments for Mental Illness,the Ability of People to Eliminate Unhealthy

Treatments for mental illness,the ability of people to eliminate unhealthy behaviours such as smoking and initiate healthy behaviours such as exercise,and the development of positive parenting practices are all consistent with which idea?

A) Psychology is based on common sense.
B) Psychological knowledge can be used to help improve quality of life.
C) Explanation and prediction are the two most important psychological goals.
D) The use of animal participants has minimal relevance to modern psychological research.