Final answer:
Life jackets are the correct safety equipment that can significantly decrease the risk of a propeller strike by keeping an individual buoyant and away from the boat's dangerous areas. Safety protocols and equipment, such as helmets and ear protectors, are also vital in other contexts to prevent accidents and injuries.
Step-by-step explanation:
When addressing the question of which equipment can significantly decrease the probability of a propeller strike, it is essential to consider safety gear specifically designed for such hazards. The correct answer is c. Life jackets, as these are part of the crucial safety equipment list on boats and can provide buoyancy in the water, mitigating the risk of coming into contact with propellers. It is important to always follow safety protocols and wear the correct equipment, such as safety goggles or sunglasses to protect eyes, hearing protectors like ear plugs in loud environments, and safety helmets for activities like bike riding. Moreover, maintaining proper protocol and equipment checklists, similar to those used in the airline industry and hospitals, can help prevent accidents both on water and in various other environments.