No improvement to this sentence is necessary. It makes perfect sense on its own and sounds right. "Either" always takes an "or" else the word wouldn't make sense, as it's meant to contrast binary options.
eg.
I'm either going to eat food or drink water.
It would be B. To send out
Once again, Melville devotes a chapter to the minutiae of the whaling industry, but in this case he extends his description of the whale line to its more metaphorical implications. Ishmael compares the whale line to a noose, and in turn compares this noose to the mortality of all humans. Once again, this metaphor takes on sinister implications, a reminder of impending death and destruction that may come at any moment.
Answer:
the answer is it moves south
