Final answer:
The National Park Service is the federal agency responsible for supervising and managing campgrounds within the national park system.
Explanation:
The agency directly related to supervising and managing campgrounds is the National Park Service. It is one of the four major federal land management agencies along with the Bureau of Land Management (BLM), US Forest Service (USFS), and US Fish and Wildlife Service (FWS) that collectively manage 90% of federal lands. The National Park Service focuses on conserving land and wildlife within the national park system.
Learn more about National Park Service and federal land management agencies here:
https://brainly.com/question/51116348
