a) He who is engaged in agriculture, herding cows and carrying out a trade or business.
b) He whose aim is to understand the Supreme Lord,and devote himself to the learning of the Vedas & literatures.
c) He who has no special knowledge but is satisfied by serving the other three classes.
d) He who has taken to displaying force and entering government administration.

The correct answer is
c) He who has no special knowledge but is satisfied by serving the other three classes.