Construct a Complete Truth Table for Each of the Following

Construct a complete truth table for each of the following arguments. 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.)
-M ⊃ N
O ⊃ M
∼N
M ⊃ ∼O / M

A) Valid
B) Invalid. Counterexample when N and O are true and M is false
C) Invalid. Counterexample when N is true and O and M are false
D) Invalid. Counterexample when O is true and N and M are false
E) Invalid. Counterexample when M, N, and O are false

Correct Answer:

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