An Island Begins to Recolonize After a Volcanic Eruption

An island begins to recolonize after a volcanic eruption.In the first year of recolonization,20 new species become established.In the second year,10 new species become established,and in the third year,5 species become established.The decrease in number of colonizing species over time most likely occurs because by years 2 and 3

A) more arrivals represent already established species.
B) fewer species from the mainland are available to colonize.
C) fewer species remain that are adapted to island conditions.
D) competition and predation are preventing new species from colonizing.
E) population growth has overwhelmed the island,leaving no space for new species.