(c) DDT
DDT is a non-biodegradable pesticide that gets accumulated progressively at each trophic level of a food chain — a phenomenon called biological magnification.
The textbook (Chapter 13) explicitly states that non-degradable chemicals like pesticides accumulate progressively at each trophic level. DDT is the classic example of biological magnification. Carbon monoxide and CFCs are air pollutants but do not biomagnify in food chains; manure is biodegradable.