For most passenger vehicles, to raise the temperature in the passenger compartment, the vehicle's hvac system uses:

A). heater core is a radiator-like device used in heating the cabin of a vehicle. Hot coolant from the vehicle's engine is passed through a winding tube of the core, a heat exchanger between coolant and cabin air. Fins attached to the core tubes serve to increase surface for heat transfer to air that is forced past them, by a fan, thereby heating the passenger compartment.

The answer might be c

Answerobninsk nuclear power plant in former ussr from1954 to 2002i believe this is the answer