The correct answer is E. Whistle-blower
Explanation:
The term "whistle-blower" is used to describe individuals who denounce illegal or unethical actions in an organization. This includes informing police or major organizations about the inappropriate actions or informing this to supervisors or people within the organization.
Martha is acting as a whistle-blower because she is informing a big organization (Occupational Safety and Health Administration or OSHA) about unsafe work conditions; which means she is denouncing illegal or improper actions to the authorities.
