If r is the ratio of the roots of the equation `ax^2 + bx + c = 0`, then r is the root of the equation. (A) `ac x^2 + (2ac-b^2) x + ac = 0` (C) `ac x^2 + (2ac-b^2) x-ac = 0` (B) `ac x^2-(2ac-b^2) x + ac = 0` (D) `ac x^2-(2ac-b^2) x-ac = 0`