Rewrite the sentence adding a nonrestrictive element using commas.
My sister is away at college.

My sister, who just turned 18, is away at college.

Explanation:

Nonrestrictive components are groups of words that can be deleted from a phrase without altering the meaning of it. Nonrestrictive components can be separated from the remainder of the phrase since eliminating them does not affect the meaning.

caliban is prospero's slave in the shakespear's play "the tempest"

your answer is b. "with strong wording encouraging readers to take action."