The correct option is
D Cockroach and
PilaHaemocoel is the body cavity of arthropods and molluscs (e.g., cockroach and
Pila), which is filled with blood. The haemocoel is an enlarged blastocoel, which greatly reduces the coelom (this is restricted to the cavities of the gonads and excretory organs). It acts as hydrostatic skeleton.
Therefore, the correct answer is option C.