What has radial symmetry?\nOptions:\n- (A) peachleaf willow\n- (B) sea urchins\n- (C) humans\n- (D) gastropod shells\n- (E) A Greek letter\n- (F) asymmetry\n- (G) dogs\n- (H) Most plants Let's solve this problem gradually.

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Adult echinoderms have radial symmetry. Sea urchins are echinoderms, in the same family as starfish. Adult sea urchins have radial symmetry. So the final answer is (B).
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