How Would a Doctor Use Surgery and Chemotherapy Together to Treat

How would a doctor use surgery and chemotherapy together to treat cancer?

A) Surgery allows the direct placement of the chemicals on the cancer to kill the cells.
B) Chemotherapy makes the patient stronger so they can better withstand surgery to remove the cancerous tumor.
C) A doctor would ordinarily use one or the other, not both.
D) If chemotherapy to kill cancer cells fails, surgery is used to try and round up and remove the cancer cells.
E) Surgery removes as much of the cancer as possible and chemotherapy is used to kill off any cancerous cells that may have been missed.