The correct answer is B. Crustaceans.
Crustaceans are a class of arthropods that includes lobsters, crabs, shrimp, crayfish, barnacles, and woodlice. They are characterized by a hard exoskeleton, a segmented body, and two pairs of antennae.
Arachnids are a class of arthropods that includes spiders, scorpions, mites, and ticks. They are characterized by a soft exoskeleton, eight legs, and two pairs of pedipalps.
Insects are a class of arthropods that includes flies, beetles, butterflies, moths, bees, wasps, ants, and grasshoppers. They are characterized by a three-part body, six legs, and one pair of antennae.
Myriopods are a class of arthropods that includes centipedes and millipedes. They are characterized by a long, segmented body with many pairs of legs.