Many Fern Gametophytes Are Hermaphrodytes,meaning They Can Produce Both Sperm

Many fern gametophytes are hermaphrodytes,meaning they can produce both sperm and egg.Why is this necessary for a fern,but not for an angiosperm?

A) If a seed colonized a new habitat alone, it could still reproduce
B) The gametophyte could produce multiple types of spores
C) The gametophyte could produce multiple types of seeds
D) If a spore colonized a new habitat alone, it could still reproduce
E) Angiosperm gametes are already diploid