d
For unique solution $\left|\begin{array}{ccc}{2} & {1} & {1} \\ {10} & {-1} & {\alpha} \\ {4} & {3} & {-1}\end{array}\right| \neq 0$
$\Rightarrow 2[1-3 \alpha]-1[-10-4 \alpha]+1[30+4] \neq 0$
$\Rightarrow \quad 46-2 \alpha \neq 0$
$\Rightarrow \quad \alpha \neq 23$
$\therefore \quad$ depend on only $\alpha$