IN Bentham and Hooker’s system of classification, the classes- Dicotyledonae and Mnocotyledonae

IN Bentham and Hooker’s system of classification, the classes- Dicotyledonae and Mnocotyledonae have the series in the ratio of
(a) 2:3
(b) 1:3
(c) 2:1
(d) 1:1