A mother sprints across the yard to grab her small child before he enters the street. The mother is using her __________. A. type I A slow-twitch muscle fibers that provided her with a fast burst of movement B. type II B fast-twitch muscle fibers that respond quickly and provide her with speed and strength C. type I B intermediate-twitch muscle fibers that respond quickly because they are delivered energy aerobically D. type II A fast-twitch muscle fibers that act rapidly because they are delivered energy anaerobically Please select the best answer from the choices provided. A B C
