Which Statement About Global Biogeographic Patterns Is True

Which statement about global biogeographic patterns is true?

A) All groups of organisms show more diversity at the tropics than at higher latitudes.
B) Most groups of organisms show more diversity at the tropics than at higher latitudes.
C) For any given latitude, the diversity of species is roughly constant for all longitudes.
D) Broad species diversity patterns are better explained by differences in longitude than differences in latitude.