Answer: D. all of the above
Ocean exploration is the process of venturing into the ocean, to make discoveries and uncover unusual or unexpected results, for possible applications in day-to-day activities.
The oceans on earth are a hotpot of every kind of thing imaginable, and things not yet discovered, so during ocean exploration, it is inevitable that a lot of valuable and useful things will turn up. Amongst these discoveries, there are diverse materials that can be applied in various fields and areas, amongst which are food, medicine, commercial products, and so on.