The two correct pieces of evidence that show Harborough considers the shark as belonging in the ocean are:
D. “The shark was not passive, in the element, as I was, it was monarch of the waves, it could drive through them with the precision of a torpedo.”
E. “had invaded a realm which I had no business to invade and its guardian was come to punish me.”
These choices highlight the shark's dominion over the ocean and suggest a distinction between its natural habitat and the narrator's presence in that space.