How Does an Actin Thin Filament Manage to Move Continuously

Multiple Choice

How does an actin thin filament manage to move continuously during a contraction cycle?

A) All of the myosin heads beat synchronously.
B) All of the myosin heads beat out of synchrony with one another.
C) They use an enormous amount of ATP.
D) They use an enormous amount of GTP.
E) none of these choices