Based on their prescribing habits, a set of doctors was divided into three groups: 1/3 of the doctors were placed in Group X because they always prescribed medication. 5/12 of the doctors were placed in Group Y because they never prescribed medication. 1/4 of the doctors were placed in Group Z because they sometimes prescribed medication. Order the groups from largest to smallest, according to the umber of doctor in each group.
A. Group X, Group Y, Group Z
B. Group Z, Group Y, Group X
C. Group Z, Group X, Group Y
D. Group Y, Group X, Group Z
