If you have a temperature above 101.2∘, then you have a fever. Casey has a temperature of
101.2∘. What can you conclude about Casey? What rule of inference did you use?
a. Casey has a fever; modus tollens
b. Casey does not have a fever; modus ponens
c. Casey has a fever; affirming the consequent
d. Casey does not have a fever; denying the antecedent