One Problem with Protecting Vulnerable Habitat Areas as a Means

One problem with protecting vulnerable habitat areas as a means of conserving species richness is:

A) that there are so few of these areas, less than 500 worldwide.
B) that multiple uses of the area sometimes conflict with the goal of preserving species.
C) that there is enough money, but not enough expertise to manage them effectively.
D) that too much of the protection is located in tropical rain forests and not enough is in remote mountain areas.
E) that too often the protected areas are in highly populated areas.