The correct option is B It is a parasite with a cynobacterium as an endosymbiont
The plastid in Plasmodium is apicoplast. The apicoplast is a non-photosynthetic plasmid that was believed to be endosymbiotic with the cyanobacterium. These organelles are necessary for the survival of the parasite as they are involved in biochemical processes. Thus the correct answer is option B.