Discussion
What is the unit preference strategy?
Answer: B
Resolving with a unit clause always shortens the other clause, so the search moves towards the empty clause rather than away from it. It is a heuristic rather than a restriction and does not affect completeness. Premise preference is input resolution, and the other options describe different rules. Preferring steps that make measurable progress towards the goal is the same principle that orders any search, applied here to clause length. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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