Correct Option: B

DDT is not soluble in water but soluble in fats. Aquatic micro-organisms absorb them in fats where they accumulate to form concentration many times greater than in water. Zooplankton accumulate more concentrations, fishes feeding on zooplanktons also accumulate more concentration and finally birds feeding on fishes contain these compounds in more concentration. This increase in accumulation of toxic substances in the food pyramids is called "Biological magnification."