C. Weitlaner retractor.
D. None of the above.
The electro surgical instrument shown in the picture above represents Diathermy.
Diathermy can be monopolar or bipolar. High frequency A.C. electric current either as a cutting modality or else to cauterize small blood vessels to stop bleeding.
This technique induces localised tissue burning and damage, the zone of which is controlled by the frequency and power of the device.