which scenario correctly illustrates heat?

cold person gets even colder when they sit in a sauna with a temperature of 105 F
cold person's hands get warmer by holding a tock that has been sitting in the sun
bathtub full of hot water gets even warmer in a cold room
ice in a cold glass of water remains ice and never melts

The scenario that correctly illustrates heat is: cold person's hands get warmer by holding a rock that has been sitting in the sun.