In Bentham and Hooker's classification the way of arrangement of the three series of polypetalae reflects this gradual evolution of flower from :

Question

$\begin {array} {1 1} (1)\;Dichlamydeous \: to \: monochlamydeous\: condition & \quad (2)\;Apocarpy\: to\: syncarpy \\ (3)\;Hypogyny \: to \: Epigyny & \quad (4)\;Bisexuality \: to \: unisexuality \end {array}$