According to the Sliding-Filament Mechanism of Muscle Contraction, the

According to the sliding-filament mechanism of muscle contraction, the

A) A bands slide in closer between the I bands.
B) thin filaments slide inward toward the center of the A band.
C) Z lines slide in between the T tubules.
D) contractile proteins contract, thus shortening the sarcomere.
E) filaments slide into the lateral sacs of the sarcoplasmic reticulum.