Megasporangium is equivalent to Embryo sac, Fruit, Nucellus, Ovule

Megasporangium is equivalent to ovule. Ovule is also called integumented magasporangium. It is present inside the ovary that is attached to the cushion called placenta. It has a single embryo sac that is formed from a megaspore through reduction division.Thus, the correct answer is option D.