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: Echinoderms use pheromones to communicate with each other., Fact2: Ascothoracican barnacles attach to echinoderms or corals., Question: corals use what to communicate with each other (A) Energy (B) pheromones (C) kinetic energy (D) produce light (E) heat produced (F) heat energy (G) Chemical energy (H) sound
B