Given the task definition and input, reply with output. 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").

Fact1: when a plant grows , the size of the leaves of that plant may increase, Fact2: All oaks are plants., Question: What can happen to an oak's leaves when the oak grows? (A) they increase in size (B) Localized damage (C) Earth revolving around the sun (D) they decrease in size (E) Exfoliation (F) The bending of a ray of light (G) they catch fire (H) they float into space
A