question_answer

If \[A=\left[ \begin{matrix}    0 & 1 & 2  \\    1 & 2 & 3  \\    3 & a & 1  \\ \end{matrix} \right]\]  and \[{{A}^{-1}}=\left[ \begin{matrix}    \frac{1}{2} & \frac{-1}{2} & \frac{1}{2}  \\    -4 & 3 & c  \\    \frac{5}{2} & \frac{-3}{2} & \frac{1}{2}  \\ \end{matrix} \right],\]  then the value of \[a-2c\] is _______.

A)  0                                

B)  1

C)  2                                

D)  3

E)  None of these