The Reason That the Various Hawaiian Honeycreepers Are Vulnerable to Extinction

Multiple Choice

The reason that the various Hawaiian honeycreepers are vulnerable to extinction is

A) the reduction of their habitats.
B) the warming of their habitats, supporting mosquitoes that carry the pathogens for avian malaria.
C) the encroachment of humans into their habitats.
D) the importation of new predators and competitors into their habitats.
E) all of these answers.