A coroner is an officer who is normally elected and whose main role is to examine any death considered to be of another than usual purposes. Mostly coroners could be considered to be most like what other type of forensic scientists that the coroners are detectives or funeral home executives so they are not doctors. They are trained in death investigation like forensic pathologists which medical coroner can do but the medical doctor cannot do.
If you wanted to cut down your risk for developing cancer, it would be best if you avoided tobacco products which is option C. Tobbaco products contain a ginormous amount of harmful ingredients which often lead people to develop cancer over time.