a B c and d are all living organisms .a B and c need ready made food whereas d can make it's own food by a natural process e the organism a can eat b as d .the organism B eat only d or its products whereas organismc eat s only organisms like B.

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Your question is not clear. However, I am providing the answer according to what I have understood. Please find below the solution
          
Organism a, B and c are heterotroph as they take readymade food while d is an autotroph (mainly green plants) as it can prepare its own food. Organism B is a herbivore as it consumes d and its products. Organism c is a carnivore as it feeds on organism B. 

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