Use the paragraph to answer the question.
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?
1. The lava tube caves are part of a cave system that provides homes for millions of bats.
2. Lava tube caves are found in a national monument.
3. The caves are a safe habitat.
4. Visitors must be screened for white-nose syndrome before visiting the caves.