Organisms which prepare food for themselves using simple naturally available raw materials are referred to as
Autotrophs are organisms that make food themselves from simple substances like water, CO2 in the presence of sunlight and chlorophyll, e.g. Green plants.
Heterotrophs are organism, which cannot make their own food and take in food prepared by the plants, e.g. Animals and humans.
Parasites are organisms, which live and derive nutrition from another organism, called host, e.g. Cuscuta plant.
Saprophytes are organism, which obtain nutrition from dead & decaying organic matter, e.g. Fungi, bacteria.
The correct option is B.