When a Health Psychologist Designs an Intervention, She Should Keep

When a health psychologist designs an intervention, she should keep in mind that ______.

A) a theoretically driven intervention has little or no attrition
B) unhealthy behaviors can return once the intervention/treatment has stopped
C) if a subset of participants does not attend all of the interventions, it will not hinder the assessment of the intervention
D) attrition is unlikely in intervention research because most people who are working on changing health behaviors are more motivated than those in other studies