the Answer:
The thermostat controls the operation of the fan motor
Step-by-step explanation:
Assuming this is a Household HVAC
The thermostat controls the operation of the fan motor, the operation of the heating elements, the compressor, and the flow of refrigerant through the A-coil
Assuming this is an Automotive application
The thermostat controls the operation of the fan motor and the flow of engine coolant