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: Echinoderms lack a centralized nervous system., Fact2: Another group of echinoderms are the echinoids., Question: What do echinoids lack? (A) characteristics (B) centralized nervous system (C) permineralization (D) the body's largest organ (E) biological diversity (F) that material's properties (G) aerobic capacity (H) organic matter
A:
B