Which of the Following Is Not Involved in the Relaxation

Which of the following is not involved in the relaxation of muscle?

A) when acetylcholine is destroyed by acetylcholinesterase.
B) when there is no longer a local action potential.
C) when the T tubules actively take up the Ca²⁺ that had been released.
D) when the actin and myosin molecules are no longer bound together.
E) when the troponin-tropomyosin complex slips back into its blocking position.