The Miami Blue Butterfly Was Thought Extinct Since the 1980s

The Miami blue butterfly was thought extinct since the 1980s, due to habitat loss and fragmentation, but two small isolated populations were recently found in the Florida Keys.There is no migration between the two populations, and effective population size is described as "critically low." Population fluctuations have been seen in recent generations, but there has been no drastic decline in population size.In the near future, the persistence of Miami blue butterfly populations will likely be threatened by all of the following factors except

A) demographic stochasticity.
B) low genetic diversity.
C) external events such as storms.
D) effective population size.
E) captive breeding programs.