The correct option is D ovule
Ovule is megasporangium and have sporogenous cells which produce megaspore by meiosis.
Megasporangium is equivalent to the ovule. Ovule is also called integumented megasporangium. The ovule is present inside the ovary that is attached to the cushion called the placenta. It has a single embryo sac that is formed from a megaspore through reduction division.
Megasporangium is a small structure attached to the placenta by means of a stalk called funicle. Each has one or two protective envelopes called integuments. Nucellus is a mass of cells enclosed with in the integuments.
Fruit is formed after fertilization. It is a ripened ovary.
So, the correct answer is "ovule"