They have hollow hair to keep warm in the winter. They roll in a pool of muddy water to avoid fly bites. They have keen hearing to sense danger in the forest. They use their wide hooves to prevent sinking in deep snow.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: How do moose use a learned behavior to protect themselves?
Possibilities:
- They have hollow hair to keep warm in the winter.
- They roll in a pool of muddy water to avoid fly bites.
- They have keen hearing to sense danger in the forest.
- They use their wide hooves to prevent sinking in deep snow.

They roll in a pool of muddy water to avoid fly bites.