14. Is the following argument a valid instance of Modus Tollens? (a) Yes (b) No (c) Cannot be determined "AD [Av (B - C)] / ~ [Av (B VC)] / / . . ~ ~ A 15. Is the following argument a valid instance of Hypothetical Syllogism? (a) Yes (b) No (c) Cannot be determined If she is a vampire, then she is undead. If she is undead, then it is not the case that she is either alive or dead). So, if she is a vampire, then it is not the case that she is either alive or dead. 16. Is the following argument a valid instance of Simplification? (a) Yes (b) No (c) Cannot be determined G =H / / . . H 17. Is the following argument: (a) valid (b) invalid (c) cannot be determined? JDL/ ROM /JVR / / .. LVM 18. Why is this argument valid or invalid? (a) It is an instance of Affirming the Consequence (b) It is an instance if Denying the Antecedent c) It is an instance of Constructive Dilemma (d) It is an instance of Addition