a)If p is F and q is F then $p \vee q$ is F
$\therefore p \vee q $ is not a tautology
b)If p is F and q is F then $p \wedge q$ is F
$\therefore p \wedge q $ is not a tautology
c)If p is T then $ \sim p $ is F
then $p \vee \sim p$ is T.
If P is F then $\sim p$ is T
then $ p \vee \sim p$ is T
$\therefore p \vee p $ is a tautology
d)If p is T then $ \sim p $ is F
then $p \wedge \sim p$ is F
If p is F then $\sim p$ is T
then $p \wedge$ is F.
$\therefore p \wedge \sim p$ is not a tautology
Hence 3 is the correct answer.