I think the butterfly effect is a prime example. Something as minuscule as a butterfly flapping it’s wings can affect and influence the course of nature. In this case, a tsunami. Of course bigger things could have caused this such as extreme winds, or an earthquake but you must never rule out the most minor changes. The tsunami is responding to a change in nature.
I could see that my fire maker was having a hard time. But I gave him his space, because I wanted the warmth of the fire.
I believe A is the best option