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Question:

To settle his nerves, Bobby whistled on the long, dark walk home from his friend's house. Why was Bobby whistling?

A because he was a little frightened
Explaination

The sentence tells us that he needed to "calm his nerves," an idiom meaning "feel less nervous or scared." There is a clue in the description of the "long, dark walk home", as well. The other responses cannot be assumed based on the information given.