Question

The _______ phylum is composed of organisms called dinoflagellates. A. Chrysophyta B. Euglenophtya C. Pyrrophyta D. Sporozoan

Answer 1

B. Euglenophtya is the answer

Answer 2

Dinoflagellates are a kind of bioluminescent algae thus they would be put in the category of Pyrrophyta. So the answer is C. 
      Hope this helps! :)
              -Jess