Detailed Instructions: 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").
Problem:Fact1: Mollusks are invertebrates such as the common snail., Fact2: Snails are protected by a hard shell on their backs., Question: What are some invertebrates protected by on their backs? (A) fur (B) parasites (C) barnacles (D) shells (E) coats (F) bones (G) bushes (H) Epidermis
Solution:
D