Please Use the Following Information to Answer the Questions Below

Please use the following information to answer the questions below.
An elementary school science teacher decided to liven up the classroom with a saltwater aquarium.Knowing that saltwater aquaria can be quite a hassle,the teacher proceeded stepwise.First,the teacher conditioned the water.Next,the teacher decided to stock the tank with various marine invertebrates,including a sea star,a sponge,a sea urchin,a jellyfish,several hermit crabs,some sand dollars,and an ectoproct.Last,she added some vertebrates-a parrotfish and a clownfish.She arranged for daily feedings of copepods and feeder fish.
-One day,Tommy (a student in an undersupervised class of 40 fifth graders) got the urge to pet Nemo (the clownfish) ,who was swimming among the waving petals of a pretty underwater "flower" that had a big hole in the midst of the petals.Tommy giggled upon finding that these petals felt sticky.A few hours later,Tommy was in the nurse's office with nausea and cramps.Microscopic examination of his fingers would probably have revealed the presence of

A) teeth marks.
B) spines.
C) spicules.
D) nematocysts.
E) a radula.