You will be given a definition of a task first, then some input of the task.
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: Cnidarians are invertebrates such as jellyfish and corals., Fact2: An invertebrate is an animal that has no spine, or backbone., Question: What don't cnidarians such as jellyfish and corals have? (A) a hosta (B) backbones (C) space between (D) a marine habitat (E) flagella (F) sea anemones (G) cells (H) cartilage
Output:
B