An Island Has a Population of 100,000 Moths That Has

An island has a population of 100,000 moths that has 98% gray individuals and 2% black individuals.Generation after generation,this ratio and population size remains basically the same.After a hurricane,10,000 black moths are blown onto the island.This is an example of

A) out crossing.
B) gene flow.
C) gene conservation.
D) inbreeding.
E) mate selectivity.