In a refrigeration system featuring low-side pump down prior to the automatic shut down of the compressor, the temperature of the refrigerated space is controlled by the action of a thermostat wired to what device?

Correct Answer: Option B — liquid line box solenoid

Low-side pump down systems maintain box temperature by cycling a liquid line solenoid valve via the box thermostat, stopping refrigerant flow and allowing the compressor to evacuate the evaporator before shutting down.