What should clients avoid applying before tanning?

Clients should avoid applying perfumes, oils, and makeup before tanning because these substances can create barriers on the skin that lead to uneven tanning results. Cosmetic products like these can interfere with the tanning process by preventing UV rays from reaching the skin effectively. The chemicals and synthetic fragrances in perfumes and makeups may also cause skin irritation when exposed to UV light, leading to potential allergic reactions or adverse skin conditions.

Moisturizers and lotions with aloe vera, on the other hand, are typically recommended for use prior to tanning as they can help hydrate the skin and may actually improve the tanning experience. Sunscreens are designed to block UV rays and should be applied after tanning to protect the skin, not before. Therefore, B is the correct choice for what clients should avoid applying prior to tanning sessions.