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(B) Let $\Delta = \left|\begin{array}{ccc}\alpha & \beta & \gamma \ a & b & c \ l & m & n\end{array}ight|$.First, swap $C_1$ and $C_2$: $\Delta =

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$3$

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(B) Let $\Delta = \left|\begin{array}{ccc}\alpha & \beta & \gamma \ a & b & c \ l & m & n\end{array}ight|$.First, swap $C_1$ and $C_2$: $\Delta = -\left|\begin{array}{ccc}\beta & \alpha & \gamma \ b & a & c \ m & l & n\end{array}ight|$.Next, swap $C_2$ and $C_3$: $\Delta = (-1)^2 \left|\begin{array}{ccc}\beta & \gamma & \alpha \ b & c & a \ m & n & l\end{array}ight|$.Finally, swap $R_1$ and $R_3$: $\Delta = (-1)^3 \left|\begin{array}{ccc}m & n & l \ b & c & a \ \beta & \gamma & \alpha\end{array}ight|$.Comparing this with the given expression, we get $K = 3$.

If $\left|\begin{array}{ccc}\alpha & \beta & \gamma \\ a & b & c \\ l & m & n\end{array}\right|=(-1)^K\left|\begin{array}{ccc}m & n & l \\ b & c & a \\ \beta & \gamma & \alpha\end{array}\right|$, then the least value of $K$ is

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