Tropical climates are found near the equator. So the tropical rain forests are found near the equator due to the amount of rain and sunshine they receive at this region.
However the temperate rain forests are found farther north coastal regions. They are not found on or near the equator.
This isn’t B, because it’s only one species. It isn’t C, because it is one population, and A doesn’t make sense due to how they are of course organisms. D is your best bet.