One impressive cave system is the lava tube caves of Lava Beds National Monument. The caves provide a safe habitat for millions of bats. In order to visit the caves, visitors must first be screened for white-nose syndrome. It is a disease that is fatal to bats. Which option best identifies the central idea of the paragraph?

A. The caves are a safe habit

B. Lave tube caves are found in national monument.

C. The lava tube caves are part of the cave system that provides homes for millions of bats.

D. Visitors must be screened for white-nose syndrome before visiting the caves