Let ABC be a triangle such that ∠ACB = π/6 and let a,b and c denote the lengths of the sides opposite to A, B and C respectively. The value(*) of x for which a = x2 + x + 1, b = x2 - 1 and c = 2x + 1 is (are)
(A) −(2 + √3)
(B) 1 + √3
(C) 2 + √3
(D) 4√3
