Which of the Following Is an Example of an Idea

Which of the following is an example of an idea for a new startup coming from an accidental discovery?

A) A coin collector, who bought and sold coins for years to build a personal collection, decides to become a coin dealer.
B) A furniture salesperson sees the possibility of opening a new furniture store in a different area of the city.
C) A sharpshooter, who shot holes in a pair of her boyfriend's jeans during an argument, hears him get complimented on the way the jeans look.
D) A local restaurant owner, noticing the success of food trucks selling crepes with unique toppings, incorporates the items into his menu.