As used in the first line of the second paragraph, the word "utter" means ______.

A．How to develop the desired attitude in children.
B．What role emotional reactions play in education.
C．How children's attitude affect their study.
D．Why undesirable attitudes are hard to eliminate.

A．the development of attitudes is most important
B．people's behavior can be shaped by direct or indirect experience
C．conscious instruction is important in shaping people's behavior
D．unpleasant experience leaves a greater impression on people