Discussion
What is the most general unifier?
Answer: D
Among all unifying substitutions the most general one leaves every choice open that need not be settled, and every other unifier is an instance of it. Committing further than necessary would lose completeness by ruling out proofs. Variable counts, clause length and arbitrary unifiers are different notions. Making the weakest commitment that achieves the immediate objective is a principle that keeps a search from foreclosing options prematurely. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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