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Q.) Suppose ( A, B, C ) are defined as ( A = a^2b + ab^2 - a^2c - ac^2 ), ( B = b^2c + bc^2 - a^2b-ab^2 ) and ( C = a^2c + ac^2 - b^2c - bc^2 ), where ( a > b > c > 0 ) and the equation ( Ax^2 + Bx + C = 0) has equal roots, then ( a, b, c ) are in:
[A]A.P.
[B]G.P.
[C]H.P.
[D]A.G.P.