6. What is the correct order of plant evolution?
(A) secondary cell wall → independent gametophytes → formation ofprotected embryo →double fertilization
(B) secondary cell wall →multicellular gametophytes → doublefertilization → formation of the protected embryo
(C) independent gametophytes → secondary cell wall → formation ofprotected embryo →double fertilization
(D)multicellulargameto phytes → secondary cell wall → double fertilization → formation of a protected embryo
(E) multicellular gametophytes → formation of protected embryo→secondary cell wall →double fertilization