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: Invertebrates are animals that lack a vertebral column, or backbone., Fact2: Fish are backboned aquatic animals., Question: Fish are aquatic animals that do not lack a what? (A) the body's largest organ (B) furry hide (C) vertebral column (D) critical organs (E) thumbs (F) aqua lungs (G) salt and water. (H) Chlorophyll
A:
C