Which sentence from the passage best states the central idea?

Question

A.
Travelers come from all over the world to visit the beautiful volcanoes of Costa Rica.
B.
Once visitors have picked a volcano and a trail, they need the right supplies and gear.
C.
However, these volcanoes can be dangerous; therefore, it is important to be well prepared.
D.
Before visiting a volcano, hikers need to know if a volcano is active, dormant, or extinct.

Answer 1

C. However, these volcanoes can be dangerous; therefore, it is important to be well prepared.