Which statement gives the correct difference between voluntary and involuntary action?

Correct answer: Voluntary action occurs by will and involuntary action occurs automatically

The governing concept is that voluntary actions are consciously controlled, whereas involuntary actions occur automatically without deliberate choice. Writing, walking, or raising a hand can normally be started or stopped by our will, so they are voluntary. Heartbeat and digestion continue automatically, so they are involuntary. Therefore option A is correct; B wrongly limits voluntary actions to plants, C reverses the idea, and D denies a real physiological difference.