When Ancestral Photosynthetic Euglenids Obtained Their Chloroplasts, the Result Was

Multiple Choice

When ancestral photosynthetic euglenids obtained their chloroplasts, the result was a chloroplast surrounded by three membranes.This is evidence of acquisition of the chloroplast by

A) primary endosymbiosis.
B) secondary endosymbiosis, retaining the chloroplast from a green alga.
C) secondary endosymbiosis, retaining the chloroplast from a plant.
D) tertiary endosymbiosis.
E) quaternary endosymbiosis.