- As the amount of available water decreases , tree-growth rings will become narrower
- Width is a property of size / shape and includes ordered values of narrow / wide
- Therefore, as the amount of available water decreases, the width of tree-growth rings becomes narrower

- As the amount of available water decreases, the width of tree-growth rings becomes narrower
- If something causes something else then the result of that something else indicate the properties of that something
- Therefore, the width of a tree-growth ring indicates the amount of available water

- The width of a tree-growth ring indicates the amount of available water
- A tree growing a tree-growth ring occurs once per year
- Therefore, the width of tree-growth rings indicate the amount of water available during the year they were formed

- The width of tree-growth rings indicate the amount of water available during the year they were formed
- Dry environments result in narrow tree-growth rings
- Therefore, a narrow tree-growth ring indicates a dry year

Therefore, a narrow tree-growth ring indicates a dry year
Question: Which conclusion is best supported by a tree-growth ring that is much narrower than the other growth rings?
Context: - As the amount of available water decreases , tree-growth rings will become narrower 
- If something causes something else then the result of that something else indicate the properties of that something 
- Width is a property of size / shape and includes ordered values of narrow / wide 
- Dry environments result in narrow tree-growth rings 
- A tree growing a tree-growth ring occurs once per year