The Deep Waters of Tropical Lakes Are Home to Very

The deep waters of tropical lakes are home to very few life forms. What best explains the low number of organisms in deep water?

A) Sunlight is unable to penetrate deeply into the water column.
B) Deep-water organisms are secondary consumers, but in tropical lakes there is very little primary production.
C) Rapid nutrient recycling in the warm upper layers of the lake use nutrients before they reach deeper waters.
D) The warm surface water is too buoyant to permit mixing with cooler, heavier water at depth, and results in low oxygen levels in deep water.