The correct answer is (B) To turn back; to return to a former condition, state, or owner; to go back to a former opinion, belief, etc.; to recur to previous subject in thought or talk.

Revert comes from Old French revertir, Latin revertere.

Examples of use:

• If left empty too long, the house will revert to its earlier dilapidated condition.
• He reverted to reading the newspaper.