According to Porter's Five Forces Model, in Which of the Following

According to Porter's five forces model, in which of the following situations would the supplier have the highest bargaining power?

A) a dealer of a patented material for smartphone manufacturers
B) a fashion designer catering to a niche market
C) a restaurant owner who serves only army veterans
D) a retailer who buys finished goods from many small suppliers
E) a defense contractor that only makes products for the U.S. Navy