Fill in the blank for the following : If a, b, c are in A.P., then the straight lines ax + by + c = 0 will always pass through ____.

Question

$\begin {array} {1 1} (A)\;(1,-2) & \quad (B)\;(1,2) \\ (C)\;(-1, 2) & \quad (D)\;(-1, -2) \end {array}$