A nail technician should be extremely careful when using which of the following to avoid skin scratches?

In the context of nail care, exfoliating scrubs typically contain granular substances that are designed to remove dead skin cells. These scrubs are meant to polish the skin and improve its texture; however, if used improperly or with excessive pressure, they can lead to skin irritation or scratches. The texture of exfoliating scrubs can be abrasive, and if a nail technician is not cautious—such as applying too much pressure or using them in sensitive areas—the risk of causing scratches or abrasions on the skin increases significantly.

In contrast, other options like soaking solutions and moisturizing creams are generally designed to soften and hydrate the skin without the potential for causing scratches. A nail file, while capable of causing injury if not used correctly, is primarily intended for filing and shaping nails rather than direct application on the skin's surface. Therefore, the focus on exfoliating scrubs demonstrates the need for careful technique and awareness of the products being used in order to maintain the health and safety of the client's skin.