It's A .... because any punishment is not the appropriate way !
A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.
I believe you are referring to the Water Cycle.
From 1918-1919 it is the deadliest in modern history it infected 500 million people world wide about 1/3 of the population at the time and killed 20 million to 50 million people
