You find a small, elongated animal embedded in sand with one end sticking out. It has segmental musculature, a coelom, a series of pores on either side of the body, and a complete digestive tract with an anus located partway down the body. This animal is: A. an annelid (segmented worm) B. either an annelid or a larval echinoderm C. either an annelid, a larval echinoderm, or a chordate D. either a larval echinoderm or a chordate E. a chordate