To compute $\det(B)$ for $B = \begin{pmatrix} 1 & 0 & 4 & 0 \\ 2 & 0 & 3 & 5 \\ 0 & 1 & 2 & 0 \\ 6 & 0 & 7 & 0 \end{pmatrix}$ using cofactor expansion, which choice would minimize computational work?