If `alpha, beta` are roots of the equation `ax^2 + bx + c = 0` then the equation whose roots are `2alpha + 3beta` and `3alpha + 2beta` is
A. `ab x^(2) - (a+b) cx + (a+b)^(2) = 0`
B. `ac x^(2) -(a+c) bx + (a + c)^(2) = 0`
C. `ac x^(2) + (a+c) bx -(a+c) bx -(a+c)^(2) = 0`
D. none of these
