One Aspect of Health Habits That Makes Them Difficult to Modify

One aspect of health habits that makes them difficult to modify is that

A) the exact point for intervention is seldom clear.
B) they are interdependent-a change in one habit is often reflected in changes in others.
C) factors controlling health behaviour are generally consistent across the life span.
D) unhealthy habits do not develop until adulthood, when they have no apparent effect on health.
E) stable personalities make change difficult.