A small pot of water has an initial temperature of 80 ° C. It is placed in a cold room where the temperature is 10 ° C. During the next few hours, the amount of thermal energy in the water decreases and its temperature ______

a) decreases to 5 ° C
b) decreases to 10 ° C
c) decreases to 45 ° C
d) decreases to 70 ° C​