【单选题】

In paragraph 3, the author is clearly expressing his idea about self-esteem. He believes that it is ______.
A．essential that self-esteem should be promoted in American schools because the author used to suffer from a lack of self-esteem as a child

B．equally important to equip children with the necessary skills and knowledge they will require in the future
C．important to remember how much school children used to suffer from a lack of self-esteem
D．reassuring to observe that children can benefit from the promotion of a positive image