Discussion
Why does likelihood weighting waste none of its samples?
Answer: C
Evidence variables are clamped rather than sampled, and each sample carries the product of the evidence likelihoods as its weight, so no sample is wasted. Performance still degrades when the evidence sits far downstream. Variable weighting, importance regions and relaxed evidence are different ideas. Understanding the weight as an importance-sampling correction explains both why it works and where it fails.
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