Several Endangered Birds Are Under Consideration for Use of an Ex

Several endangered birds are under consideration for use of an ex situ conservation program to save their species. Species A lives in a relatively stable habitat but is extremely rare. Species B is also extremely rare, and lives in a habitat threatened by possible human expansion. Numbers of species C have plummeted in the last 50 years to less than a hundred individuals and the survivors live in a habitat that is declining but could be improved over time. Which of these species should conservationists choose for their ex situ program?

A) Species A, because of its rarity.
B) Species B, because of the potential human threat.
C) Species C, because of its rapid decline and its recoverable habitat.
D) Any of the three species, because their situations are relatively similar.