The correct answer is option C) in the tropics.
The most diverse and productive biomes are located in the tropics which are situated in the middle of the globe surrounding the equator. The reason behind this is that tropics receive ample sunlight almost through out the year and have plenty of water. The primary productivity of tropical rainforests is around 9,000 Kcal per meter^2 per year which is highest amongst all the biomes. Also, their hot and humid environment makes it a perfect place to live in. That is why they are quite rich in wildlife variety.
