Given below are four sentences in jumbled order. Pick the option that gives their correct order.

A: Sam Walton, the owner of Walmart, built his empire on one principle – Customer is the King.
B: The customer thus has the right to fire anybody in the company, from a salesman to the chairman.
C: In fact, his belief was that customers are the origin, the source of money any company has.
D: So it is not the company that pays, the customer does.