Species Turnover on Islands Has Been Observed to Be Low

Species turnover on islands has been observed to be low. What does this suggest about process in the equilibrium model of island biogeography?

A) Facilitation is of minor importance to this model.
B) Secondary succession rarely succeeds.
C) Succession on most islands is a fairly orderly process.
D) The intermediate disturbance hypothesis can explain colonization rates.
E) Immigration of new species often can not keep up with extinction.