定义在$R$上的函数$f\left(x\right)$满足$f\left(x\right)=\{\begin{array}{c}{\log }_2(4-x),x\le 0\\ f(x-1)-f(x-2),x>0\end{array}$，则$f\left(3\right)$的值为(      )

A．

-1

B．

-2

C．

1

D．

2