Hello!
The answer is C. Coercive.
Why?
According to the bases of power, coercive power means that someone can punish someone who deserves it when it's needed, punishment can be just punishment but it can also mean serious actions as demoting, restricting privileges or in the last instance, firing people.
Coercive power can be a problem if it's applied to everyone, every time, the result of coercive actions applied in an inappropriate way could result in useful people resignations. That's why coercive tools are the last resort if corrections are needed.
Have a nice day!