According to humanists,why are animal studies of little relevance to understanding humans

A)  Animals do not develop mental disorders. 
B)  Animals do not have a self-concept. 
C)  Animals have a much shorter period of development. 
D)  Animals cannot communicate their thoughts to us.

Humanists believe that animals lack a self-concept, which makes animal studies of little relevance to understanding humans. This is because human self-concept is a defining characteristic of human nature, and humanists argue that it is this self-concept that shapes our experiences and behaviors. Other choices are not necessarily true; for example, animals can develop mental disorders and can communicate their thoughts through non-verbal means.