Question:
Goal: how do you prove something?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
explain how it happened.

Question:
Goal: how do you make a bike move?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
sit on it, and pedal with your feet.

Question:
Goal: How do I make block of wood feel smooth?

Which of the following methods is more reasonable for accomplishing this goal?
Answer:
Use a piece of sandpaper and rub the rough side against the wood.