Last Month, the Cable Service Was Out at Frank's House

Last month, the cable service was out at Frank's house for four days. When he called the cable company, they agreed to credit his next bill for a full week of service and gave him free access to a popular movie channel for the next six months. Frank felt this was adequate compensation for the inconvenience. What is this an example of?

A) economy of scale
B) the knowledge gap
C) distributive fairness
D) empowerment fairness
E) word-of-mouth