According to the article, why protecting Glacier National Park is important?

a
Protecting Glacier National Park is important because it contains different plants, endangered species, and water resources.

b
Protecting Glacier National Park is important because it has extreme weather changes that affect its landscape.

c
Protecting Glacier National Park is important because many tourists visit the national park and learn about the environment each year.

d
Protecting Glacier National Park is important because people have left the park virtually unchanged for many years.