The correct answer is C) noisy compressor operation upon starting. When the liquid-line solenoid valve is leaking during the 'off' cycle, it allows refrigerant to continuously flow back to the compressor. This can result in liquid refrigerant accumulating in the compressor crankcase, causing a condition known as 'liquid slugging.' When the compressor starts up, the liquid refrigerant will be drawn into the compressor, leading to a noisy and potentially damaging operation. The other options are incorrect because a leaking liquid-line solenoid valve would not directly cause high superheat in the outlet coil (A), refrigerant slugs in the receiver (B), or low suction pressure (D). The primary issue is the liquid refrigerant accumulation in the compressor crankcase, which leads to the noisy compressor operation upon starting.