b
$\left|\begin{array}{ccc}2 & 3 & -1 \\ 1 & 1 & 1 \\ 1 & -1 & \mid \lambda\mid\end{array}\right|=0$
$\Rightarrow|\lambda|=7 \Rightarrow \lambda=\pm 7.......(1)$
System:
$2 x+3 y-z=-2........(2)$
$x+y+z=4.......(3)$
$x-y+|\lambda| z=4 \lambda-4......(4)$
Eliminating y from equal $(2)$ and $(3)$ we get $x+4 z=14.....(5)$
$(3)+(4) \Rightarrow x+\left(\frac{|\lambda|+1}{2}\right) z=2 \lambda........(6)$
Clearly for $\lambda=-7$, system is inconsistent.