Correct option is (c) \( 14\hat i - 38\hat j + 16\hat k\)
\(\vec \tau = \vec r \times \vec F\)
\(= (7\hat i + 3\hat j + \hat k)(-3\hat i + \hat j + 5\hat k)\)
\(\vec \tau =\begin{vmatrix}\hat i&\hat j & \hat k\\7&3&1\\-3&1&5\end{vmatrix}\)
\(= 14\hat i - 38\hat j + 16\hat k\)
