Many Years Ago Someone Developed an Item That Was Simply

Many years ago someone developed an item that was simply a small rock inside a box with holes. The person earned large profits from selling "pet rocks." Which of the following theories on the source of profits best describes the reason behind this success?

A) Uncertainty is a source of profits.
B) Profit is the reward for alertness to arbitrage opportunities.
C) Profit is the return to the entrepreneur as innovator.
D) There's a sucker born every minute.
E) Sometimes all that it takes is to be in the right place at the right time.