In cattles, when red one is crossed with white, an intermediate roan coloured offspring is formed in F1 generation. When selfing of F1 generation was carried, the result obtained was
(A) 2 Red, 1 Roan, 1 White
(B) 1 Red, 2 Roan, 1 White
(C) 1 Red, 2 Roan, 2 White
(D) 1 Red, 1 Roan, 1 White
