The Chloroplast of Red Algae Retains Certain Pigments of the Original

Multiple Choice

The chloroplast of red algae retains certain pigments of the original cyanobacterial endosymbiont that are absent in the chloroplasts of green algae.The evolutionary significance of this is that

A) red algae cannot photosynthesize, leading to heterotrophy.
B) neither green algae nor red algae can be classified as protists.
C) chloroplasts originated as free-living prokaryotes.
D) red algae are cyanobacteria.
E) red algae are prokaryotes.