A boy is standing at the centre of a boat which is free to move on water. If the masses of the boy and the boat are m1 and m2 respectively and the boy moves a distance of 1 m forward then the movement of the boat is ...... metres
(A) M1/m1+m2
(B) m2/m1+m2
(C) m1/m2
(D) m2/m1
