The Cuticulata, Which Includes Diverse Organisms Such as Arthropods and Nematodes

The Cuticulata, which includes diverse organisms such as arthropods and nematodes, is so called because

A) all organisms in this group have a body covering that consists of a single-layered cuticle.
B) all organisms in this group have a body covering that consists of a two-layered cuticle.
C) all organisms in this group have a body covering that consists of a triple-layered cuticle.
D) all organisms in this group have a body covering that consists of a unique cuticle composed of cartilaginous tissue.
E) unlike most other protostomes, this group is so called because it entirely lacks a cuticle.