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: Sponges are filter feeders., Fact2: Bottom dwelling organisms such as coral, urchins, and sponges provide a colorful backdrop., Question: What can bottom dwelling organisms be? (A) humans (B) coliform (C) filter feeders (D) damaging (E) arachnids (F) fire creators (G) ecosystems (H) rock eaters
A:
C