Which statement would be MOST important to include in a summary of the article?
A:Giving people cash when they go to the gym makes them exercise more frequently.
B:"Mulligan" groups are more likely to follow through with their habits than groups without a mulligan.
C:Research shows that there are specific strategies that can help people start new habits.
D:Piggybacking a new habit with an enjoyable activity can help create a new habit.