In Order for the Red Areas on the Figure Below

In order for the red areas on the figure below to represent biodiversity hotspots, which of the following criteria would have to be TRUE?

A) There has to be more bird species in the area than in another area of the same biome for that region to be considered a biodiversity hotspot.
B) There has to be at least 100 native bird species and 100 native plant species for the area to be a biodiversity hotspot.
C) There has to be at least 1500 native plant species, and habitat reduction of the original area, for the area to be designated a biodiversity hotspot.
D) There has to be high diversity in three different taxonomic groups (i.e., mammals, plants, birds, amphibians, etc.) for the area to be a biodiversity hotspot.