Question

what does the national park service manage?
memorials
wildlife refuges
ecosystems
endangered species

Explanation:

The National Park Service manages a variety of areas including memorials, and also focuses on the ecosystems within parks. Wildlife refuges are mainly managed by other agencies like the U.S. Fish and Wildlife Service, and while the NPS may work to protect endangered species within its parks, its main management focus is on the overall park - including memorials and ecosystems.

Answer:

A. memorials, C. ecosystems