What do these two changes have in common?
breaking a piece of glass
butter melting on a hot day

 - Both are only physical changes.
 - Both are caused by heating.
 - Both are chemical changes.
 - Both are caused by cooling.
Step 1: Think about each change.
Breaking a piece of glass is a physical change. The glass gets broken into pieces. But each piece is still made of the same type of matter.
Butter melting on a hot day is a change of state. So, it is a physical change. The butter changes from solid to liquid, but it is still made of the same type of matter.
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.
Butter melting on a hot day is caused by heating. But breaking a piece of glass is not.
Both are caused by cooling.
Neither change is caused by cooling.