The correct option is (f).
Work Step by Step
The provided statement shows that narrator advised to avoid casual contacts with suspected AIDS carriers because scientists have not proved yet that AIDS cannot be transmitted through casual contact. Hence, the provide statement is a fallacy of ignorance because fallacy of ignorance is type of fallacy in which someone claims that a statement is true simply because it has not been proven false, or vice versa. Thus, this is a type of fallacy of ignorance.