The magnitude of swaying couple due to partial balance of the primary unbalancing force in locomotive is
(a) Inversely proportional to the reciprocating mass
(b) Directly proportional to the square of the distance between the centre lines of the two cylinders
(c) Inversely proportional to the distance between the centerlines of the two cylinders
(d) Directly proportional to the distance between the centerlines of the two cylinders