设 $f(x)=x^2-5 x+3, A =\left[\begin{array}{cc}2 & -1 \\ -3 & 3\end{array}\right]$ ，定义 $f( A )= A ^2-5 A +3 E$ ，称其为矩阵 $A$ 的多项式，则 $f( A )=(\quad)$ ．
A. $\left[\begin{array}{ll}3 & 0 \\ 0 & 2\end{array}\right]$
B. $\left[\begin{array}{ll}2 & 0 \\ 3 & 3\end{array}\right]$
C. $\left[\begin{array}{ll}0 & 0 \\ 0 & 0\end{array}\right]$
D. $\left[\begin{array}{cc}2 & 3 \\ -1 & 0\end{array}\right]$