TOEFL Reading: ETS-TOEFL阅读机经 - 63G3A80UK15MU5D5L$

According to paragraph 2, why has the public been prevented from visiting most caves that contain prehistoric art? A. Space within caves is usually limited, so priority is given to scholars and art experts. B. Cave containing artworks are often located in difficult-to-reach places. C. Artworks can be damaged by environmental changes that result from opening a cave. D. Many caves containing artworks are unsafe for the general public to enter and wander through.