What do these two changes have in common?
butter melting on a hot day
grilling a hamburger

 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
Step 1: Think about each change.
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.
Grilling a hamburger is a chemical change. Heat from the grill causes the matter in the meat to change. Cooked meat and raw meat are different types of matter.
Step 2: Look at each answer choice.
Both are only physical changes.
Butter melting on a hot day is a physical change. But grilling a hamburger is not.
Both are chemical changes.
Grilling a hamburger is a chemical change. But butter melting on a hot day is not.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.