How many infant life vests are onboard?

The correct answer indicates that there are 5 infant life vests onboard. In situations involving safety equipment on vessels or aircraft, it's important to have a sufficient number of life vests to accommodate all passengers, including infants. The number of infant life vests is typically correlated with the capacity of the vehicle and its safety regulations, which often require specific quantities for different groups of passengers.

In this case, having 5 infant life vests suggests that the vessel or aircraft is equipped to ensure that all infants on board can be safely secured in case of an emergency. This aligns with standard safety practices where providers are required to ensure that safety equipment is readily available and meets the needs of all passengers. Thus, the choice of 5 demonstrates an adherence to safety standards while also indicating that the number of life vests is adequate for the expected number of infants.