What do these two changes have in common?
water evaporating from a lake
building a tower out of magnetic blocks

 - Both are chemical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
 - Both are only physical changes.
Step 1: Think about each change.
Water evaporating from a lake is a change of state. So, it is a physical change. The liquid changes into a gas, but a different type of matter is not formed.
Building a tower out of magnetic blocks is a physical change. The blocks stick to each other to form a tower. But the blocks are still made of the same type of matter as before.
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.
Water evaporating is caused by heating. But building a tower out of magnetic blocks is not.
Both are caused by cooling.
Neither change is caused by cooling.