the conclusion? (A pair of twins jane and jan have dinner in a restaurant. The twins have identical susceptibility to food poisoning.Jan order soup,salad, chicken, carrots, rice, and no ice cream .Later Jane gets sick from something she ate , but Jan does not. Such a situation suggests that the ice cream caused the sickness ). A.Method of concomitant variation B.Method of difference C.Joint method of agreement and difference D.Method of residues E.Method of agreement