(B) Human beings
Human beings occupy the top trophic level, so the maximum concentration of toxic chemicals accumulates in their bodies through biological magnification.
The passage states: "As human beings occupy the top level in any food chain, the maximum concentration of these chemicals get accumulated in our bodies." This process is called biological magnification — toxic substances like pesticides accumulate progressively at each trophic level, so the highest-level consumer is affected most. Always remember: higher trophic level = greater accumulation of toxins.