For the equilibrium $A_{(g)} \rightleftharpoons B_{(g)}+C_{(g)} ;K_p=0.82 atm$ at $27^{\circ}C$. At the same temperature its $K_c$ in mol $lit^{-1}$ is : ( R=0.082 lit atm $mol^{-1}K^{-1}$)

Question

$\begin {array} {1 1} (1)\;0.033 & \quad (2)\;3.3 \\ (3)\;1.0 & \quad (4)\;0.33 \end {array}$