= Solution
\b[Choose CLOCK for page replacement in a conventional operating system.] Good <temporal locality> makes recency valuable, and <CLOCK page replacement> captures it reasonably well using cheap reference flags. <FIFO page replacement> ignores accesses after a page arrives, so it can evict a hot page. Exact <LRU replacement> has a stronger recency rule but recording and maintaining the order on every ordinary memory access is usually too costly. This is a practical cost-versus-hit-rate choice, not a theorem that <CLOCK page replacement> minimizes faults on every reference sequence.
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