Read the passage. Then answer the question. The caves in Carlsbad Caverns National Park are magnificent, but many visitors come to see the bat flights. More than a quarter-million Brazilian free-tailed bats (also known as Mexican free-tailed bats) live in the caves. At night, they all fly out to hunt insects.

Which sentence would make a good concluding statement for the passage?

A. Make sure to visit Carlsbad Caverns on your next trip to New Mexico.

B. The Big Room cave is something visitors will never forget.

C. Carlsbad Caverns gives visitors a wonderful underground vacation.

D. The bats of Carlsbad Caverns make the park an even more incredible place to visit.