Angiosperms Have Two Separate Gametophytes Because

Multiple Choice

Angiosperms have two separate gametophytes because

A) this is normal for alternation of generations.
B) one can survive and fertilize without the need for external water.
C) the microgametophyte is haploid and the megagametophyte is diploid.
D) these two structures allow fertilization without the need for external water.
E) this is normal for all sexually reproducing plants,where sperm are produced by microgametophytes and eggs by megagametophytes.