Some other examples of biocontrol agents other than Bacillus thuringiensis is/are?

The correct options are
A Trichoderma
D Baculovirus
Trichoderma species are free-living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens.
Baculoviridae or baculoviruses are pathogens that attack insects and other arthropods.
Mycorrhiza and Rhizobium are both helpful to plants in different ways but they do not kill pests, so they are not biocontrol agents. Mycorrhiza is the symbiotic association between a fungus and a plant whereas Rhizobium is a genus of bacteria that help in nitrogen fixation.