Discussion
What is unification's role in first order resolution?
Answer: C
Resolution requires complementary literals, and in first order logic they may match only after variables are instantiated, which unification computes. Without it a prover would have to enumerate ground instances, which is what the Herbrand approach does far less efficiently. Clause merging is resolution itself, and duplicate removal is factoring. Operating on variables directly, rather than on their instances, is what lifts a propositional method to the first order case.
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