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

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

A) If one seed colonizes a new habitat,reproduction can occur in later stages.
B) The gametophyte can produce multiple types of spores.
C) The gametophyte can produce multiple types of seeds.
D) If one spore colonizes a new habitat,reproduction can occur in later stages.
E) Angiosperm gametes are diploid.