Which of the following is considered a cosmetic?

The choice that defines a cosmetic is a product intended to enhance beauty through application on the human body. Cosmetics include items like makeup, lotions, and creams that are designed to improve appearance, enhance features, or provide a pleasant scent. Their primary function is aesthetic rather than functional or health-related.

The other options do not align with this definition. Cleaning products are meant for hygiene and maintenance of surfaces; food items are designed to nourish and promote health; and body modification tools are primarily associated with altering the body rather than enhancing beauty through topical application. Thus, the focus on beauty enhancement through application on the human body solidifies why the selected choice is deemed a cosmetic.