The control of caterpiller is also done by

Answer: Option C

The control of caterpiller is also done by Bacillus thuringiensis.
Bacillus thuringiensis (Bt) is known as the most successful microbial insecticide against different orders of insect pests in agriculture and medicine. Moreover, Bt toxin genes also have been efficiently used to enhance resistance to insect pests in genetically modified crops.
It is used to kill beetles and the larvae of mosquitoes, black flies, caterpiller, and moths. Bt is also toxic to nematodes. Bt has been registered for use in pesticides by the U.S. Environmental Protection Agency since 1961.