Final answer:
Walter's offer of a raise to Irene in exchange for a romantic relationship is an example of quid pro quo harassment, which is a form of sexual harassment and is illegal.
Step-by-step explanation:
When a supervisor offers a work-related reward in exchange for a sexual favor, this is known as quid pro quo harassment. This type of sexual harassment is characterized by a power imbalance where organizational rewards, such as promotions or raises, are conditional upon the submission to sexual advances or relationships. It distinctly differs from hostile-environment harassment, which involves a pattern of creating an intimidating or offensive work atmosphere through unwanted sexual behavior or remarks. In the scenario provided, Walter's proposition to Irene, offering her a raise in exchange for a romantic relationship, can be classified as quid pro quo harassment. This type of conduct is not only a violation of workplace policies but is also illegal under civil rights laws that protect individuals from discrimination and harassment based on sex.