People Often Say That the Best Way to Motivate Others

People often say that the best way to motivate others is to increase their self-esteem, as in "Find a way to make people feel good about themselves, and then all sorts of good things start to happen." In response to this approach to motivation, the textbook concluded that:

A) no research exists on self-esteem because it is best studied through personal experience.
B) a great deal of evidence supports this approach to motivation.
C) practically no evidence supports this approach to motivation.
D) while not perfect, increasing self-esteem is still the most effective approach to motivating other people.