The correct option is
C Study of altered physiology of host
Pathophysiology means the functional changes associated with or
resulting from a disease or injury or the functional changes associated
with a disease or syndrome canal that solubilises the crystals. The
activated toxin binds to the surface of might epithelial cells and
create pores which causes cell swelling of midgut epithelial cells and
create pores which causes cell sewelling and lysis and finally death of
the insect.
So, the correct answer is 'Study of altered physiology of host'.