What condition must be satisfied for extension seatbelts to be used?

Extension seatbelts are specifically designed for use in certain scenarios to ensure passenger safety on flights. The correct choice, which indicates that the passenger must be either an infant or oversize, is aligned with the principles of aviation safety and comfort.

For infants, standard seatbelts do not accommodate their size, and using an extension allows for secure fastening while ensuring they can be safely held in place during the flight. Similarly, for oversize passengers, the extension seatbelt provides a necessary adjustment to ensure that these individuals can also be secured properly without compromising safety standards.

When considering other choices, it’s clear that they do not encompass the broader criteria necessary for the use of extension seatbelts. Business class seating, having a child as a passenger, or requiring all adult passengers to wear them do not address the specific conditions related to size and safety that necessitate the use of extensions. Thus, the focus on infants and oversize passengers highlights the safety considerations that guide the implementation of extension seatbelts in aviation.