Q: 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: Adult echinoderms have radial symmetry., Fact2: Sea urchins are echinoderms, in the same family as starfish., Question: What has radial symmetry? (A) peachleaf willow (B) sea urchins (C) humans (D) gastropod shells (E) A Greek letter (F) asymmetry (G) dogs (H) Most plants
A:
B