The answer to your question is C.
Answer:
I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I—
I took the one less traveled by,
And that has made all the difference.
From the book directly:
"No animal must ever live in a house, or sleep in a bed, or wear clothes, or drink alcohol, or smoke tobacco, or touch money, or engage in trade. All habits of Man are evil. And above all, no animal must ever tyrannize over his own kind. Weak or strong, clever or simple, we are all brothers."
I think the answer would be purpose. I'm not sure though.