Answer:
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Step-by-step explanation:
C) Block the inlet of the valve.
A blocked drain on a pressure-reducing valve can prevent the valve from functioning correctly by blocking the drain line that is used to relieve excess pressure from the valve. As a result, the inlet of the valve can become blocked, causing the valve to malfunction and preventing it from reducing pressure. It is important to keep the drain line clear to ensure that the pressure-reducing valve works properly.