“When someone fails repeatedly to overcome weaknesses and achieve some mastery or simply places excessive emphasis on some particular inferiority.” Who illustrated the above statement as 'inferiority complex'?

Correct option is D

According to Adler, the hallmark of an inferiority complex is that “persons are always striving to find a situation in which they excel”. This drive is due to their overwhelming feelings of inferiority.
There are two components of these feelings of inferiority: primary and secondary. Primary inferiority is the “original and normal feeling” of inferiority maintained by an infant. This feeling is productive, as it provides motivation for the child to develop.
Secondary inferiority, on the other hand, is the inferiority feeling in the adult results when the child develops an exaggerated feeling of inferiority. These feelings in the adult are what is harmful, and they comprise the inferiority complex.