The correct option is
B Animal- Duckbill platypus, Characteristic- Oviparous, Taxon-
MammaliaMillipede is myriapod and not belong to Arachnida.
Silver fish is an insect and not chordate and it also does not posses pectoral and pelvic fins.
Sea anemone is diploblastic and not triploblastic.
Duck billed platypus is a small semi aquatic oviparous mammal. It has a beak like a duck, webbed forelimbs for swimming, clawed hind feet for aid in burrowing, a common opening for the reproductive, excretory and digestive systems and a broad, flat tail. Males have a single spur on each hind ankle that contains venom and the females lay eggs.
Therefore, the correct answer is option B.