The answer is (c) biomagnification
Biomagnification can be interpreted as the rise or increase in the contaminated substances caused by the intoxicating environment. These substances are taken up by the organisms through the food they consume. When the organisms in the higher food chain feed on the organisms in the lower food chain containing these toxins, these toxins get accumulated in the higher organisms. The contaminants might be heavy metals such as mercury, arsenic, and pesticides such as polychlorinated biphenyls and DDT.