Corina Almost Always Shops at Gas-N-Go

Corina almost always shops at Gas-N-Go. She finds it to be easy to access from the highway, likes the people and receives special discounts as a frequent customer. Corina is less likely to shop around for her next purchase because Gas-N-Go has reduced the hassle, thereby:

A) reducing the gas station's profit margin
B) maximizing Corina's solo exchange profit
C) increasing Corina's buyer's profit
D) replacing a functional relationship with a boundary-spanning customer satisfaction investment
E) producing an exploratory relationship