What is the minimum clear opening area required for an escape window?

The minimum clear opening area required for an escape window is defined by building codes to ensure safety during emergencies, such as fires. The correct answer of 5 square feet is based on National Fire Protection Association (NFPA) standards and international building codes, which stipulate that escape windows must provide a clear opening that is large enough for a person to exit through quickly and safely.

This requirement ensures that individuals can escape from a building without obstacles in an emergency situation. The specified dimension of 5 square feet is designed to accommodate various sizes and shapes of individuals, ensuring accessibility for everyone. The opening's width and height are also critical factors that determine whether it meets the necessary criteria, but the clear area serves as a fundamental measurement to ensure sufficient space for an emergency exit.

In comparison, any other options listed do not meet the established safety standards set by relevant codes, and thus would not provide adequate escape routes in emergencies.