Here's a problem to solve: Which example describes a behavioral adaptation?

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

- A: A bird builds its nest in the ash near a volcano.
 
- B: A whale has the ability to hold its breath for 20 minutes.
 
- C: A fox's hair is white in the winter and brown in the summer.
 
- D: A monkey has long arms that allow it to swing from one branch to another.
 