Question: According to the endosymbiotic theory, the outer membrane of the chloroplast originated from which organelle?

  Options: 
 A. the lysosome of an engulfed prokaryotic cell
 B. the chloroplast of an engulfed prokaryotic cell
 C. the cell membrane of an eukaryotic host cell
 D. the chloroplast of an eukaryotic host cell
Answer: C