Ferns Often Maintain High Diversity Even on Very Isolated Islands

Multiple Choice

Ferns often maintain high diversity even on very isolated islands. This is because

A) ferns are often planted deliberately by human colonists.
B) ferns are often introduced accidentally by human colonists.
C) ferns are easily dispersed by light wind-blown spores.
D) ferns are easily dispersed because birds carry their seeds.
E) new fern species most often evolve on isolated islands.