Yes salt can be found in the ocean.
<span>"I
think he hardly knew what he was saying, for when I asked him what
business he was in he answered, 'That’s my affair,' before he realized
that it wasn’t the appropriate reply. 'Oh, I’ve been in several things,' he corrected himself."<span>Gatsby was rude, and it made Nick suspicious.</span></span>
It was caused by an earthquake.
The best correction of the clause fragment is to C. delete the word "although."
Without that word, you get a proper single independent sentence, and not a fragment.
