Final answer:
Melissa's comment is an example of rationalization, where she provides a plausible reason for her behavior to avoid admitting her unconscious fear of being outperformed by her husband in cooking.
Step-by-step explanation:
Melissa's comment illustrates the defense mechanism known as rationalization. This occurs when a person justifies or explains their behavior or feelings in a seemingly logical or rational way, often to avoid confronting the true underlying emotions or motivations. Melissa's refusal of her husband's offer to cook by suggesting he spend time with the kids seems like a reasonable explanation, but it may unconsciously stem from her fear that he is a better cook than she is.