Fact: a tree growing a tree-growth ring occurs once per year
Question: A person cuts down their neighbor's tree without permission. The neighbor who lost the tree is upset, and sues for the cost of the tree, which depends on the age of the tree at the time of cutting. The tree age is determined by

What's the answer?
*size of branches;
*number of leaves;
*color of roots;
*number of circles;
number of circles