Answer:
C. Once forged, loyalty is a powerful opponent for even Buck's natural instincts
Explanation:
In the excerpt, it mentions how "even when Buck felt strongly the natural instincts that were calling from the wild, 'the love for Thompson drew him back to the fire again'" This means that his loyalty is stronger than his natural instincts. This makes Answer A wrong. Answer B is also incorrect because we don't know that without Buck, Thompson would have died- it is also irrelevant to the question specifically. Lastly, Answer D was rather close to being correct, but it said loyalty alone was what kept Buck tied to Thompson , when it was love as well.
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