Noise is _______________

The correct answer is C. Undesirable and unwanted sound.

Noise is unwanted or unpleasant sound. It can be caused by a variety of things, including vehicles, machinery, and people. Noise can be harmful to our health, both physically and mentally. It can cause stress, anxiety, and even hearing loss.

Option A is incorrect because it is too broad. Noise can be any sound, not just a huge sound.

Option B is incorrect because it is too specific. The sound of vehicles is just one type of noise.

Option D is incorrect because it is too narrow. The sound of crackers is just one example of an undesirable and unwanted sound.