The resource that is renewable is trees.
Renewable resources are resources that can be replenished naturally over time, either through natural processes or human intervention. Trees are a renewable resource because they can be replanted and grown again after they are harvested for wood or other products. When forests are managed sustainably, meaning they are harvested in a way that does not exceed the forest's ability to regenerate, trees can provide an ongoing supply of wood products without depleting the resource.
On the other hand, petroleum, coal, and iron are non-renewable resources. These resources are finite and can only be extracted from the earth's crust once. Once they are extracted and used, they cannot be replenished. As a result, they are considered non-renewable resources.
Therefore, the resource that is renewable is trees.