Final Answer:
An integral trap is a device that retains a quantity of liquid each time a plumbing fixture is used, thus producing a measure of the volume of liquid. Option C is the answer.
Step-by-step explanation:
An integral trap is a component built into a plumbing fixture, such as a sink or bathtub, designed to hold a certain amount of water to prevent sewer gases from entering the living space. When the fixture is used, the integral trap retains a specific volume of liquid, forming a water seal that acts as a barrier against odors and gases. This design ensures proper drainage while maintaining a protective barrier. Unlike standalone traps, integral traps are seamlessly incorporated into the fixture, providing an efficient and space-saving solution.
Option C is the answer.