It is a good idea to accept a promotion interview, even if you’re not interested in the promotion because
a. turning down a promotion you don’t want is easier after an interview
b. it could be good practice for the time you do want a promotion
c. being able to use up your supervisor’s time will make you seem important
d. having a promotion interview will give you an automatic wage increase

The second alternative is correct (B).

Although the professional is not interested in the promotion in question, it may be interesting to participate in the process as a learning experience. In this way, the professional can understand the mechanisms of this type of selective process to prepare for when the opportunity arises that he wishes.

In addition, the selective process is the moment of a better detailing of the functions and the search for the skills of the position, being possible that during the process the professional perceives points of convergence between him and the vague proposal that he had not seen before.