Discussion
When is backward chaining preferable to forward chaining?
Answer: B
Backward chaining works only on the rules relevant to the query, so it avoids deriving the vast number of true but irrelevant conclusions that forward chaining would produce. Continuous data arrival favours forward chaining instead. Explanation is available from either, and a knowledge base without rules supports no chaining at all. Directing computation by what is actually wanted, rather than computing everything and selecting afterwards, is a principle far wider than inference.
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