When would a cup of hot coffee left on the counter stop transferring heat?

a
When it has gained all of the air's thermal energy
b
When it has lost all of its thermal energy
c
When the room temperature air has transferred all of its coldness to the coffee
d
When it has reached the same temperature as the room temperature air

d. When it has reached the same temperature as the room temperature air.

d

When it has reached the same temperature as the room temperature air