Which of the following statements is incorrect about grade-two thinkers? ( )
A.Grade-two thinkers challenge many thoughts, but they don’t know how to establish constructive ideas from them.
B.Grade-two thinkers tend to be indifferent to worldly matters, even though they can clearly see and hear how unreasonable they are.
C.Grade-two thinkers have moments of delight because they abandon prejudice, ignorance and hypocrisy.
D.Grade-two thinkers can easily find the contradictions in some people’s thoughts and behavior.