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: Plants use unsaturated fatty acids to store energy., Fact2: Plants like cactus and sagebrush can survive., Question: what uses unsaturated fatty acids to store energy (A) clouds (B) volume (C) density (D) Conifers (E) organisms (F) Oak (G) cactus (H) alpacas
G