Biopesticides are certain types of pesticides made up of living microorganism. Bacillus thuringiensis (or Bt) is biopesticide that can block the gut of insects and kill them. Trichoderma harzianum: This is a bio-pesticide useful for the management of fungal pathogens such as Fusarium species and Phytophthora species as well as nematodes. The nuclear polyhedrosis virus (NPV) which belongs to the family Baculoviruses is a virus affecting insects, predominantly moths and butterflies. It has been used as a pesticide for crops infested by insects susceptible to contraction. Xanthomonas campestris is bacterial species that causes a variety of plant diseases. It is a plant pathogen. Therefore, the correct answer is option C.