If $f(x)=x^3+x^2-ax+b$ is divided by $x^2-x$ then the values of $a$ and $b$ are ______

Question

$\begin{array}{1 1}(A) \;a=-2,b=0\\(B)\;a=0,b=-2\\(C)\;a=2,b=0\\(D)\;a=0,b=2\end{array} $