In a sample of pond water, a new organism is identified with the following characteristics: It consists of 70 cells surrounded by rigid cell walls that join the cells together. Inside each of these identical cells are mitochondria and chloroplasts. Such an organism would most likely be classified as a

A) colonial photosynthetic eukaryote.
B) fungal photosynthetic eukaryote.
C) colonial photosynthetic prokaryote.
D) multicellular photosynthetic prokaryote.
E) colonial eukaryotic fungus.