Proper hydration can enhance which of the following aspects of a tan?

Proper hydration plays a significant role in enhancing the longevity of a tan. When the skin is well-hydrated, it maintains its elasticity and overall health, which helps the tan last longer. Hydrated skin is less prone to peeling and flaking, both of which can cause the color of the tan to fade more quickly. Additionally, adequate hydration can ensure that the skin maintains a vibrant appearance and can better process and retain the pigmentation from tanning products or sun exposure, thereby increasing the duration of the tan.

The other choices reflect negative conditions associated with improper hydration. Skin dryness can lead to various issues, including increased flakiness, which detracts from the appearance of a tan. Color fading and rough texture are also associated with dehydrated skin. Therefore, proper hydration directly affects the longevity of a tan by promoting a healthier skin barrier and optimal pigment retention.