Suppose you are cold-weather camping and decide to heat some objects to bring into your sleeping bag for added warmth. You place a large water jug and a rock of equal mass near the fire. Over time, both the rock and the water jug warm to about 38 °C (100 °F). If you can bring only one into your sleeping bag, which one should you choose to keep you warmer? Why?

(a) The water, because it will release more heat as it cools.

(b) The rock, because it will absorb more heat as it cools.

(c) The rock, because it will release more heat as it cools.

(d) The water, because it will absorb more heat as it cools.