What do these two changes have in common?
baking an apple pie
a sidewalk heating up in the sun

 - Both are caused by heating.
 - Both are only physical changes.
 - Both are caused by cooling.
 - Both are chemical changes.
Step 1: Think about each change.
Baking an apple pie is a chemical change. The type of matter in the pie changes. The apples become soft, and the crust turns brown.
A sidewalk heating up in the sun is a physical change. The temperature of the sidewalk goes up, but the sidewalk is still made of the same type of matter.
Step 2: Look at each answer choice.
Both are only physical changes.
A sidewalk heating up in the sun is a physical change. But baking a pie is not.
Both are chemical changes.
Baking a pie is a chemical change. But a sidewalk heating up in the sun is not.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.