The correct choice is (c) To obtain toxic products
Easy explanation: Vermicomposting uses earthworms for composting by degrading the organic wastes present in the bulk waste material by various methods and the major objective is to obtain products free of any pollutants and hence, toxic products are eliminated in the process, and the other two objectives of Vermicomposting are to elevate the value of original material and to accelerate the rate of degradation.