Amother 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