Fact 1: When a plant grows , the size of the leaves of that plant may increase.

Fact 2: All oaks are plants.

Given the two facts above, answer the question "What can happen to an oak's leaves when the oak grows?" with the following options: 
- they increase in size
 - Localized damage
 - Earth revolving around the sun
 - they decrease in size
 - Exfoliation
 - The bending of a ray of light
 - they catch fire
 - they float into space


 

 they increase in size        