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: skin is used for breathing air by frogs, Fact2: Frogs breathe and absorb water through their skin, which is periodically shed., Question: How do frogs absorb oxygen? (A) They drink water (B) flow of electrons (C) Jumping really high (D) during the day (E) By breathing through their nose (F) matter vibrating (G) Through their skin (H) circulatory systems
G