The question mark belongs to variety of herbivores and carnivores common between temperate and tropical rain forests.  Thus option D is correct.
What are the difference between temperate and tropical rain forests ?
The climate of tropical rainforest is a hot , moist biome and the rain fall continue a year-round.
 
These rainforests are seen in 10 degrees of the equator and the average  temperatures is 64° F and annual rain fall  is minimum 1.67 meters. 
on the other hand, Temperate rainforests, the minimum rainfall is 1.4 meters and temperature 39° F. 
Thus option D is correct.
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