Which of the following is a diploid structure present in the ovule of Capsella before fertilization?

In angiosperms,the following events occur during megasporogenesis and megagametogenesis:
$(i)$ Differentiation of megaspore mother cells
$(ii)$ Meiosis of the megaspore mother cell
$(iii)$ Formation of a linear tetrad
$(iv)$ Mitotic division of the functional megaspore
$(v)$ Degeneration of $3$ megaspores
$(vi)$ Formation of embryo sac
$(vii)$ Fusion of polar nuclei
The correct sequence is:

Choose the correct option for the embryo sac of angiosperms.

Identify the labels $A, B, C,$ and $D$ in the given diagrams.

Megasporangia arise from the ....

The nutritive tissue present in the ovule is called