What are the two types of individual flotation devices provided on the 737?

The correct choice identifies the two types of individual flotation devices provided on the Boeing 737 as a life vest and an infant life vest. This distinction is vital for safety measures, as the aircraft must accommodate passengers of all ages, especially ensuring the safety of young children during emergencies.

Adult life vests are designed for passengers weighing above a certain threshold, while infant life vests cater specifically to the needs of infants or very small children, ensuring they have appropriate flotation support in an emergency water landing. Having both types available onboard fulfills regulatory requirements and enhances overall passenger safety.

Understanding the specific types of flotation devices helps crew members effectively communicate safety information to passengers and ensures that all necessary equipment is available for a range of passenger needs.