What do these two changes have in common?
picking up a paper clip with a magnet
water freezing into ice

 - Both are caused by cooling.
 - Both are caused by heating.
 - Both are only physical changes.
 - Both are chemical changes.
Step 1: Think about each change.
Picking up a paper clip with a magnet is a physical change. The paper clip sticks to the magnet, but it is still made of the same type of matter.
Water freezing into ice is a change of state. So, it is a physical change. The water changes from solid to liquid. But the ice is still made of the same type of matter as the liquid water.
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.
Neither change is caused by heating.
Both are caused by cooling.
Water freezing is caused by cooling. But picking up a paper clip with a magnet is not.