You should use your horn when a. your view of the road is obscured by a vehicle ahead of you b. you're following a long line of cars c. there is no other way to avoid a collision

The answer is C. That’s what I think

Your answer is C, there is no other way to avoid a collision. A horn on a car is not meant to honk at bad drivers or to tell cars ahead to move faster, a horn on a car is meant to alert other drivers if a crash is likely or you are unable to do any other crash-preventing actions.

The bell is just a signal that the set time of the end of class is passing. the teacher lets you know when it's okay to leave.

Your answer should be “b”