Consider the following data: ∙ Most ancient eukaryotes are unicellular. ∙ All eukaryotes alive today have a nucleus and cytoskeleton. ∙ Most ancient eukaryotes lack a cell wall. Which of the following conclusions about the first eukaryotes is most consistent with the data presented?
A) They were very similar to a plant cell. B) They were anaerobic. C) They were capable of phagocytosis. D) They were photosynthetic.