What do these two changes have in common?
melting wax
your breath becoming visible on a cold day

 - Both are caused by heating.
 - Both are caused by cooling.
 - Both are only physical changes.
 - Both are chemical changes.
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.
Your breath becoming visible on a cold day is a change of state. So, it is a physical change. Water vapor in your breath touches the cold air outside and becomes liquid. The water vapor changes state, but it is made of water. A different type of matter is not formed.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are physical changes. No new matter is created.
Both are chemical changes.
Both changes are physical changes. They are not chemical changes.
Both are caused by heating.
Wax melting is caused by heating. But your breath becoming visible on a cold day is not.
Both are caused by cooling.
Your breath becoming visible on a cold day is caused by cooling. But melting wax is not.