Construct a complete truth table for the following argument. Then, using the truth table, determine whether the argument is valid or invalid. If the argument is invalid, choose an option which presents a counterexample. (There may be other counterexamples as well.)
P ⊃ Q
Q · R / ~P · R
(A)Valid (B)Invalid. Counterexample when P, R, and Q are true (C)Invalid. Counterexample when P and Q are true and R is false (D)Invalid. Counterexample when R and Q are true and P is false
B