Here's a problem to solve: How do moose use a learned behavior to protect themselves?

Among the 4 following options, which is the correct answer?

- A: They have hollow hair to keep warm in the winter.
 
- B: They roll in a pool of muddy water to avoid fly bites.
 
- C: They have keen hearing to sense danger in the forest.
 
- D: They use their wide hooves to prevent sinking in deep snow.
 