When can children under the age of 12 ride for free with a fare-paying adult?

Children under the age of 12 can ride for free with a fare-paying adult anytime, which makes this option correct. This policy is designed to encourage family travel and make public transportation more accessible for families. It simplifies the fare structure for adults who might otherwise need to worry about purchasing additional tickets for their children.

The other scenarios suggested by the remaining options incorrectly limit the circumstances under which children can ride for free. By allowing free rides at any time, it provides convenience for families, whether they are traveling to school, recreational activities, or other appointments. This inclusive policy reflects a broader commitment to supporting family mobility in the community.