Troponin Assists in Controlling the Interaction Between Myosin Heads and Thin

Troponin assists in controlling the interaction between myosin heads and thin filaments by

A) forming a long chain that covers the active sites.
B) holding the tropomyosin strands in place.
C) moving the tropomyosin molecules to expose the active sites.
D) assisting in the formation of the myofilaments.
E) both holding and moving the tropomyosin strands.