Which of the following is an effect of alcohol in aftershave?

Aftershave products often contain alcohol because it acts as an antiseptic, which helps to kill bacteria on the skin. This is particularly beneficial after shaving, as shaving can create tiny nicks and cuts where bacteria could enter the skin, leading to irritation or infection. The antiseptic properties of alcohol in aftershave contribute to reducing the risk of post-shave irritation and can help provide a sense of cleanliness and freshness.

While other effects might be associated with aftershave—such as moisturizing or providing a cooling sensation—these do not directly pertain to the role of alcohol in the formulation. Alcohol does not typically have moisturizing properties; in fact, it can sometimes be drying to the skin. Similarly, the sensation of cooling, while pleasant for some users when applied, is not a primary effect of alcohol itself. Rather, those sensations might come from other ingredients within the product. Thus, the primary and significant role of alcohol in aftershaves is its antiseptic effect, which supports skin health and hygiene after shaving.