Which one of the following organisms is likely to show the highest concentration of DDT, once it has been introduced into the ecosystem?

(c) DDT is non-biodegradable chemical. Biomagnification is the phenomenon of increasing concentration of compound in the tissue of organism, as the compound passes up a food chain, usually as a result of food intake. In this case, the concentration of compound will increase with increasing the tropic level. Biomagnifying pollutants which increases in concentration from producers → Primary consumers → Secondary consumers → Tertiary consumers →Top consumer.

The snake is a tertiary consumer. So the DDT concentration will high in snake.