In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: the number of rings in a tree trunk can be used to estimate the age of the tree, Fact2: Tree rings record the seasons., Question: How can we learn about the seasons by using a tree? (A) Tasting the tree leaves (B) Something that can be auburn (C) it keeps an organism warm (D) Measuring the height of the tree (E) Help plants grow (F) By looking at the trunk (G) Something that is self-aware (H) Chopping down the tree
A:
F