Final answer:
An esthetician should use either a gel mask or a paraffin mask for hydrating the skin and reducing fine lines, with gel masks offering a refreshing hydration boost and paraffin masks sealing in heat to promote circulation and hydration. The correct option is A or B.
Step-by-step explanation:
If Charlene is looking to hydrate her skin and reduce fine lines, her esthetician should consider using a gel mask or a paraffin mask. Gel masks are often formulated with ingredients that boost hydration and can leave the skin feeling cool and refreshed.
On the other hand, paraffin masks have a unique way of sealing in the heat, which helps to increase circulation and in turn, can promote skin hydration and potentially help in the reduction of fine lines. While a thermal mask might also help to improve circulation, it doesn't specialize in hydration, and clay/mud masks are primarily used for detoxifying and oil absorption and might not be the best choice for hydrating skin.