What additional requirement must a person under 12 meet to operate a boat with a motor over 6 hp?

The correct response highlights that a person under the age of 12 must possess a boating safety certificate and be supervised by an adult in order to legally operate a boat with a motor exceeding 6 horsepower. This requirement is in place to ensure that young boat operators have received adequate training on boating safety regulations, navigation rules, and emergency procedures.

The necessity of supervision further reinforces safety, allowing an experienced adult to oversee the operation of the boat, which is especially important for younger and less experienced individuals. This dual requirement not only promotes safe boating practices but also helps prevent accidents and injuries on the water.

The other options do not align with the specific regulations governing young boat operators. For example, while wearing a life jacket is important for all boaters, it is not the additional requirement specified for operating a motorboat in this context. Similarly, a valid driver's license is not a criterion for operating a boat, and the last option incorrectly suggests that individuals under 12 are entirely prohibited from operating boats over 6 hp, which is not the case if they meet the stipulated conditions.