Explanation:
To correctly answer this question, we need to identify the correct sequence of labeled parts in the structure of a flower’s ovule and related reproductive parts.

Let’s break down the typical path and structure from the outside of the flower’s female reproductive part (pistil) down to the ovule:

1. Stigma – the top part that receives pollen
2. Ovary wall – outer wall of the ovary, contains ovules
3. Integument – protective layers around the ovule
4. Micropyle – a small opening in the integuments where the pollen tube enters
5. Embryo sac – inside the ovule, contains the egg cell

So the correct sequential order from outside to inside is:
Stigma → Ovary wall → Integument → Micropyle → Embryo sac

Now let’s match this order with the corresponding numbers in the options. The correct figure sequence is:

A. 12453