Which of the following is a typical sign of a refrigerant leak affecting system performance?

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A refrigerant leak reduces the system’s refrigerant charge, which directly impairs heat transfer and increases the workload on the compressor. With less refrigerant circulating, the evaporator can’t absorb as much heat, so cooling drops and the thermostat must run the compressor longer to try to reach the desired temperature. The condenser side has to reject heat from hotter, more highly superheated gas, which often pushes the high-side (head) pressure higher than normal. The compressor ends up working longer and harder, increasing the risk of strain or failure. These signs—less cooling, longer run times, higher head pressures, and potential compressor strain—fit a leak affecting performance. The other options describe outcomes that wouldn’t occur with a refrigerant leak, such as improved cooling, lower head pressure, or no change in performance.