What do these two changes have in common?
melting wax
baking an apple pie

 - Both are only physical changes.
 - Both are chemical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
Step 1: Think about each change.
Melting wax is a change of state. So, it is a physical change. The wax changes from solid to liquid. But it is still made of the same type of matter.
Baking an apple pie is a chemical change. The type of matter in the pie changes when it is baked. The crust turns brown, and the apples become soft.
Step 2: Look at each answer choice.
Both are only physical changes.
Melting wax is a physical change. But baking a pie is not.
Both are chemical changes.
Baking a pie is a chemical change. But melting wax is not.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.