The correct option is A Gypsy moth
Nosema locustae is a microsporidium fungus that is used to kill grasshoppers, caterpillars, and crickets. It affects the digestive system of grasshopper through a build up in the gut, eventually killing it by creating lethargy and lack of appetite. So, the microbial pesticide Nosema locustae are effective against for grasshoppers.
So, the correct option is option C (Grasshoppers).