Refer to the Figure Showing Sarcomeres of Various Lengths

Short Answer

Refer to the figure showing sarcomeres of various lengths. Which panel (A-C) best illustrates the state of the sarcomeres in your biceps muscle fibers during these phases of a pull-up: hanging full length from a pull-up bar; applying the maximum amount of force as you pull yourself up towards the bar; pulling yourself up the last few inches to reach the bar.