I would say either b of c but I would definitely go with c
Cide - denoting a person or substance that kills
Ectomy - denoting surgical removal of a specified part of the body
Ism - a distinctive practice, system, or philosophy, typically a political ideology or an artistic movement
Logy - dull and heavy in motion or thought; sluggish.
A time line, aroma, scheme, indulgent, assertive
