Which four cadet ribbons are possible to wear backwards?

The option identifying the four cadet ribbons that can be worn backwards is correct because, in various cadet programs, certain ribbons are designed to indicate achievements that can be celebrated even if worn in reverse.

The Distinguished Cadet ribbon symbolizes exceptional performance and can be displayed backward to acknowledge a distinguished career path that does not strictly follow conventional expectations. The Physical Fitness ribbon can also be represented in this manner, indicating that cadets who participate in physical training have improved beyond certain standards, deserving recognition regardless of their placement. The Unit Service ribbon typically signifies a cadet's contributions to their unit, and wearing it backward can recognize the less conventional or understated efforts of a cadet's service. Lastly, the Color Guard ribbon symbolizes participation in ceremonial duties, and wearing it backward may highlight a cadet’s commitment to the formal aspects of their training and duties.

The other options contain ribbons that either do not conform to this practice or represent achievements that do not lend themselves to the concept of being honored through backward display. For example, ribbons for leadership or academic excellence typically represent clear achievements and are usually worn in their conventional forward position to convey status and accomplishment directly.