Final answer:
The scenario where a supervisor promises a promotion in exchange for a date with an employee is an example of quid pro quo harassment.
Step-by-step explanation:
The situation described, where Madeline's supervisor has offered her a promotion with a pay increase in exchange for accepting a date, best describes an example of quid pro quo harassment. This occurs in employment settings when job benefits such as promotions, raises, or continued employment are offered in exchange for own favors. It is a form of misconduct that violates workplace regulations and creates an unfair and potentially hostile work environment. This would require immediate attention and appropriate action from the company's Human Resources department or a legal entity to ensure a safe and equitable work environment.