Strong Chemical Mutagens May Be Used to Treat Cancer Cells

Strong chemical mutagens may be used to treat cancer cells. Is this a good or bad idea?

A) Good-kill those cancer cells as quickly as possible to cure the patient!
B) Bad-these mutagens will also affect the non-cancerous cells, possibly leading to new cancerous states!
C) Good and bad-they're very good at killing cancer cells, but they could also be dangerous to non-cancerous cells.
D) Bad-the cancer cells are already mutated. We don't want to mutate them more and make them more cancerous!
E) Bad-the medications are toxic and will cause healthy normal microbiots to become cancerous.