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Comprehensive and Detailed Explanation:

Reading Comprehension questions on the POSS exam measure a candidate's ability to locate information, identify key facts, and draw conclusions directly from written material. In this passage, the report clearly states that the valves showed only minor wear and that operating the system until the next planned shutdown posed no safety concerns. This information directly supports option C.

Option A is incorrect because the passage never mentions parts availability. Option B is incorrect because the supervisor scheduled replacement during a future shutdown, indicating the system was still operating. Option D is also unsupported because there is no indication that the inspection was incomplete.

A useful POSS strategy is to avoid making assumptions and focus only on information explicitly stated in the text. Industrial operators frequently review maintenance logs, operating procedures, and technical reports. Therefore, the ability to identify the exact reason for an operational decision is important. The best answer is the one most directly supported by thepassage rather than one that seems plausible based on outside knowledge. Since safety concerns were absent and replacement could wait until scheduled maintenance, option C is the correct answer.