The correct option is C Pleura
The cockroach has a dorsoventrally flat, compressed body which is covered by a hard, chitinous exoskeleton. It is in the form of separate plates. The dorsal plate is called tergum and the ventral plate is called sternum. Laterally, the plates are joined by pleura. So, outer border of tergum bends downwards in cockroach and attaches with pleura. So, the correct answer is option C.