Which of the Following Processes Is/are Exothermic?
1)the Reaction of Butane

Which of the following processes is/are exothermic?
1) the reaction of butane with oxygen
2) the melting of gold
3) cooling copper from 225 ^$\circ$ C to 65 ^$\circ$ C

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3