Selaginella is heterosporous. It produces two types of spores. The microspore develops into microgametophyte and the megaspore develops into megagametophyte. With respect to gametophyte, which one statement is correct

• A.            The microgametophyte is devoid of chloro\[\sim \]phyll at maturity
• B.            The megagametophyte possesses chlorophyll at maturity
• C.            The megagametophyte develops within the walls of megaspore
• D.            The microgametophyte develops chlorophyll at maturity