Answer:
D) to reduce the chance that the cancer would reoccur.
Step-by-step explanation:
Chemotherapy is often used to kill the remaining cancerous cells and prevent them from grow and reproduce again, cancer is not other thing than cells growing in a different way than the one they are supposed to grow, so basically they are damaging tissue that surrounds them, by using chemothreapy you attack the cancerous cells that are still being produced and eliminate that genetic material from spreading.