The tree would get sunlight. The tree would provide shelter for birds. The sidewalk might crack as the tree grows. The temperature of the sidewalk would drop.
I gave my students this multiple choice question: Which is the best reason for planting a tree away from a sidewalk?

Only one answer is correct among these 4 choices:
- The tree would get sunlight.
- The tree would provide shelter for birds.
- The sidewalk might crack as the tree grows.
- The temperature of the sidewalk would drop.

Could you tell me which one is correct?

The sidewalk might crack as the tree grows.