If the volume of parallelopiped with conterminus edges $4 \hat i+5 \hat j+\hat k, -\hat j+\hat k$ and $3 \hat i+9 \hat j +p \hat k$ is 34 cubic units, then p is equal to :

Question

\[\begin {array} {1 1} (a)\;4 & \quad (b)\;-13\\ (c)\;13 & \quad (d)\;6\end {array}\]