Answer:
From the cup to the hand.
Explanation:
Note that heat flows from the region of higher temperature to a region of lower temperature.
If a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, therefore the heat flow will be from the coffee(higher temperature) to the body at 36°C. This is due to the temperature gradient i.e difference in temperature of the two bodies.
The heat from the coffee will be transmitted to the hand.
