The correct option is D Both a and b
Septifragal dehiscence is found in both option A and B. If the dehiscence occurs along the septa, it is septicidial jfalong the dorsal sutures of the respective carpels (Ioculicidal) or by both when the seeds are left on the central column after falling of the valves is septifragal When dehiscence is loculicidal or septicidal, the fruit is septifragal.