If the vectors \(\rm \vec{a}=2\hat{i}-3\hat{j}+\hat{k}, \vec{b}=\hat{i}+2\hat{j}-3\hat{k}\) and \(\rm \vec{c}=\hat{j}+p \hat{k}\) are coplanar, then what is the value of p?

• A. 1
• B. -1
• C. 5
• D. -5