Which of the Following Is the Best Example of the Bargaining

Which of the following is the best example of the bargaining power of suppliers?

A) The ability of a dominant microprocessor manufacturer to set industry standards and charge premium prices.
B) The inability for a customer to terminate a supply contract.
C) The ability of a customer to shop around for suppliers.
D) The customer's flexibility to switch suppliers at any time.
E) The ability to negotiate better terms with a commodity producer after a competitive bidding process.