If $\large\frac{x^2+x+1}{x^2+2x+1}$$=A+\large\frac{B}{x+1}+\frac{C}{(x+1)^2}$ then $A-B=$

Question

$$\begin {array} {1 1} (1)\;4\;C & \quad (2)\;4\;C+1 \\ (3)\;3\;C & \quad (4)\;2\;C \end {array}$$