Q: look at the illustration in figure 25-3. which of the following internal characteristics would you expect this animal to have?
answer choices:
a. coelom
b. deuterostome
c. radial symmetry
d. a notochord

Option A; Coelom

Earthworms are coelomate species. They are included under the phylum Annelida, which have bilateral symmetry. They don't have radial symmetry, that's why option C is incorrect. Notochord is present in chordates, and absent in earthworms, thus option D is also incorrect. Earthworms are not deuterostomes, instead they protostomes. Thus, option B is also incorrect.

nucleus

would be most reasonable answer tbh