In anthem, the narrator's name, equality 7-2521, to develop a theme that all people deserve equal opportunity. individuality is lost in a collective society. brotherhood and cooperation strengthen society. individual differences are inconsequential.

The answer is "individuality is lost in a collective society."

In the collectivist society of Anthem, it's basically unlawful to consider yourself by any stretch of the imagination. Nobody can pick their vocation, their companions or love interests, nothing. Equality 7-2521 is an inquisitive, addressing fellow who longed for turning into a Scholar when he grew up. Rather, he's doled out to be a Street Sweeper - that is the place society needs him.  

This causes a strain in Equality 7-2521's reasoning. He's adapted by community to trust that what's best for society in general outweighs his own bliss, however he feels corrupted and underestimated. His brilliant personality is squandered on road clearing, so he begins stretching out and revolting in little ways. Finding the passage and tinkering with the light enable him to express his natural advantages and gifts.

(b) Purposive

Explanation:

When any work has done for a specific purpose then the work is said to be purposive.

When there is conscious intention for doing any work then it is said that the work has done for any purpose on the other hand when there is no conscious intention for doing the work then work is called purposeless.

Here Fredrick has purposive incentive for joining the specific interest group