Besides the evaporator pressure, the thermal expansion valve reacts directly to changes in what parameter?

Correct Answer: Option C — temperature of the evaporator coil outlet

Thermal expansion valves (TXVs) maintain constant superheat by balancing three forces: the bulb pressure (sensing evaporator outlet temperature), the evaporator pressure, and the spring pressure. By sensing the temperature at the evaporator outlet, the TXV modulates refrigerant flow to ensure the compressor receives only vapor, preventing liquid slugging.