Expert power usually stems from
a. a person's ability to penalize the actions or behavior of another.
b. a superior's credibility with his or her subordinates.
c. a person's ability to influence the behavior of others by offering them something desirable.
d. a person's perceptions that his or her goals or objectives are similar to another's.
e. the belief that a certain person has the right to exert influence and that certain others have an obligation to accept it.

Option b.

Explanation:

Expert power will be power dependent on representatives' observation that a supervisor or some other individual from an association has an elevated level of information or a specific arrangement of abilities that different workers or individuals from the association don't have.  Expert power is an extraordinary advantage for have. It gives pioneers a strong power base from which they can oversee individuals certainly. As per the executives educator Gary A. Yukl, master power is a higher priority than remuneration based or coercive power in driving individuals successfully.