Use a Truth Table to Answer the Following Question $\frac { N } { N \equiv T}$

Multiple Choice

Use a truth table to answer the following question.Which, if any, set of truth values assigned to the atomic sentences shows that the following argument is invalid? $\frac { N } { N \equiv T}$

A) N: T T: T
B) N: T T: F
C) N: F T: T
D) N: F T: F
E) None-the argument is valid.