Final answer:
The best gear to put on for exploring the ancient volcano of Mahukona is diving gear, as it is a submerged geological formation located off the coast of Hawaiʻi.
Step-by-step explanation:
If you were looking for the ancient volcano of Mahukona, the best gear to put on would definitely be C. Diving gear. The Mahukona volcano is an ancient, submerged volcano located northwest of the island of Hawaiʻi. This unique geological formation isn't something you can visit wearing typical clothes due to its underwater location. To manage a visit, you'd have to be in appropriate diving gear to explore the underwater depths where the remnants of the volcano now reside. It's a fascinating part of Hawaii's natural history and attracts geologists and divers alike.