Read the introduction.

voter participation is the cornerstone of a democratic society, and america’s young people should seize this privilege as soon as they are able. some youth wait until a presidential election year or until confronted with a compelling political issue. instead, everyone ought to register on his or her eighteenth birthday and embrace this rite of passage into adulthood.

what is the author’s purpose?

to persuade young adults to run for political office
to persuade young adults to register to vote
to inform readers about the history of elections
to inform readers about democratic traditions

to persuade young adults to register to vote.

Explanation:

It is their right to vote as they go into adulthood.  same way at 18 they can join the military and make decision without parental consent.

B) to persuade young adults to register to vote.

Explanation: When writing, an author can use have different purposes, for example to persuade, inform or impact the audience in a desired way. The given excerpt is giving information about the importance of voting and registering as soon as turning eighteen years of age. So the purpose of the excerpt is to persuade young adults to register to vote, corresponding to option B.

credit should be the answer