An example of community infrastructure is _______________.

Community infrastructure refers to essential facilities and systems that serve the public and contribute to the overall functionality and quality of life within a community. The correct example, which includes power plants and municipal water supply, highlights critical services that provide energy and water essential for both residential and commercial areas.

Power plants are vital for generating electricity, enabling homes and businesses to operate efficiently, while municipal water supplies ensure that residents have access to clean water for drinking, sanitation, and other necessary daily activities. These elements are foundational to a community's health and welfare, supporting essential operations and infrastructure needed to function effectively.

The other options, while they may involve infrastructure, are more specific to particular systems or components rather than broad community facilities. For instance, roads and schools are critical, but the first option mixes various system types, including fire protection systems, which do not broadly represent community infrastructure. Similarly, underground piping and fire pumps focus on specialized applications, and riser sprinkler mains pertain specifically to fire protection rather than broader community services.