Answer:
The correct answer is letter "B": whistleblower.
Step-by-step explanation:
Whistleblowers are individuals working for a private company or a body of the government who have witnessed unusual activity within the organization where they work and report those events to the corresponding authority so further investigations can be carried out to determine if there is an illegal action being committed or not.
These individuals are covered by the Whistleblower Protection Act of 1989 in front of possible retaliation taken by the agencies reported in the form of salary reductions or terminations.