Final answer:
The most appropriate response is to encourage the co-worker to document and report the harassment to their supervisor or Human Resources.
Step-by-step explanation:
The most appropriate response when a co-worker complains about being sexually harassed by a customer is option a. Encourage them to document the harassment and report it to their supervisor or Human Resources.
Sexual harassment is defined as unwelcome sexual advances, requests for sexual favors, or other verbal or physical conduct of a sexual nature that affects an individual's employment or creates a hostile work environment. It can occur between co-workers, supervisors, or even non-employees such as customers. Therefore, it is important to take complaints seriously and guide the victim through the process of documenting and reporting the harassment to the appropriate channels.
By encouraging the co-worker to report the harassment, you are supporting their rights and well-being, and taking steps to create a safe and respectful workplace environment.