Which best explains how a heat pump can heat a room? Cold air from the house is moved through pipes, where it absorbs thermal energy.
Warm air from outside is pushed into the house to replace the cold air.
Combustion warms the air when chemical energy is transferred to thermal energy.
Fuel is used to move a piston, which pushes warm air into the house.

Cold air from the house is moved through pipes, where it absorbs thermal energy.

Explanation:

Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space, making the cool space cooler and the warm space warmer. ... The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.

Is this helpful

a and b sometimes have a positive value

i think the answer is a and b

i wish you luck