An urn contains marbles of four colours : red ,white ,blue and green.When four marbles are drawn without replacement,the following events are equally likely:
(1) the selection of four red marbles;
(2) the selection of one white and three red marbles;
(3) the selection of one white , one blue and two red marbles;
(4) the selection of one marble of each colour.
The smallest total no. of marbles satisfying the given condition is
(A) 19                   (B)21
(C)46                    (D)69