The answer is the D.
All of the choices above are good practices that would increase the chance of attaining a successful personal fitness program. Goals that are broken down into short-term and long-term goals ensure a person's commitment to specific fitness goals. Activities that interest a person is a motivating factor to improve the quality of a person's fitness program; while implementing a reward system (e.g. ice creams only during Fridays, eating fastfood at the end of the week) removes the plateau and boredom of following a strict exercise routine.
