Answer: (B) Reference group
Step-by-step explanation:
A reference group is basically refers to the individual and the group that is specifically used for the comparison purpose. It is one of the type of group that share a common attitude, beliefs and the behavior for making the various types of decisions.
According to the given question, a shoe's company is one of the most popular music band as the products sales of the company significantly increase. Then, from the fans point of views the band is refers to the reference group.
Therefore, Option (B) is correct answer.