Protogynous diuranally synchronous dichogamy is observed in

Answer: Option B

Protogynous diuranally synchronous dichogamy is observed in Avocado.
The avocado flower has a unique flowering behaviour, in addition, the avocado flower has a very interesting bisexual quality in which the flower opens twice. First opening in the female stage, then closing and opening the next day in the male stage. This phenomenon is called protogynous, diurnally synchronous dichogamy.
The dichogamy is protogynous, as the pistil matures before the stamens in both types and all flowers of type A are synchronous to be functionally female at one time of the day and functionally male at anther time. The combination of protogynous dichogamy and the flowering behaviour of the avocado prevents self-pollination promoting outcrossing.