the sliding filament theory states that during contraction ____ . multiple choice question. A. sarcomeres shorten because myosin myofilaments slide past actin myofilaments towards the m line B. sarcomeres shorten because actin myofilaments slide past the myosin myofilaments C. sarcomeres shorten because myosin myofilaments become shorter as subunits are added to actin myofilaments D. sarcomeres shorten because actin myofilaments become shorter as subunits are added to myosin myofilaments