C. The ocean remains largely unexplored, and advances in technology are improving our ability to study it. The author supports this by discussing historical challenges, new technologies, and potential benefits.
This central idea encapsulates both the current state of ocean exploration and the progress being made through technological advancements. By highlighting the historical challenges, the author illustrates why the ocean has remained largely unexplored. Additionally, by discussing new technologies, the author shows how these advancements enable more effective exploration and study of the ocean, thus emphasizing the potential benefits of understanding this vast environment.