Which Action is an Example of Voluntary Muscle Contraction

Question

Which action is an example of voluntary muscle contraction?
A) a push-up
B) peristalsis
C) a heartbeat
D) stomach churning

Accepted Answer

A push-up is an example of voluntary muscle contraction because the individual consciously decides to contract their muscles to perform the movement.

Other options given are for involuntary muscle contractions:
B) Peristalsis is the involuntary contraction and relaxation of smooth muscles that help move food through the digestive system.
C) A heartbeat is an example of involuntary muscle contraction as the heart contracts and relaxes rhythmically to pump blood throughout the body. 
D) Stomach churning is also an example of an involuntary muscle contraction as the contractions in the stomach help break down food and move it along the digestive tract.