What is alternative rock? A: . rock music that developed as a reaction to heavy metal, and therefore was quieter, and more reliant on meaningful lyrics about social issues B: . rock music that has more pop elements; mostly light and cheerful, with less distorted guitars C: . rock music that is very hard and edgy, borrowing elements from reggae skank, and usually has very short songs D: . rock music that has a very fast tempo and is usually used at clubs for dancing