Final answer:
Goggles designed for tanning are the best option to provide full coverage and protection from UV rays during tanning sessions, which is essential to avoid eye damage and other health risks.
Step-by-step explanation:
The goggles specifically designed for tanning, option C, provide adequate eye protection when using a tanning bed. While sunglasses and prescription glasses may offer some protection due to the fact that plastic lenses can block most UV radiation, tanning goggles are made to ensure full coverage and prevent UV rays from reaching the eye from the sides. Eye protection from UV is particularly important as repeated exposure to UV-B radiation can lead to eye damage like cataracts, and safe eyewear is necessary to prevent acute effects such as immune system suppression.