All Except One of the Following Are Reasons Why Maslow

All except one of the following are reasons why Maslow should be considered one of the great psychologists. Which is NOT a reason for his greatness?

A) The evidence supporting self-actualization is accumulating so fast, criticism of the notion may someday be deemed trivial.
B) His idea that entities may be arranged in hierarchies is original with him and has spread to all other branches of science.
C) He had a solid scientific background.
D) His is a model for us all in that he overcame a distressing childhood and anti-semitism to become a fine person and major contributor.