The correct option is A Presence of replum
Brassica campesteris belongs to family Brassicaceae.
Flowers of family Brassicaceae shows parietal placentation.
Flowers of family Brassicaceae shows superior ovary i.e. sepals and petals are below the ovary. Such flower is called as Hypogynous.
Flowers of family Brassicaceae has unilocular ovary.
Flowers of family Brassicaceae e.g., Brassica campesteris possess unilocular ovary which becomes bilocular due to false septum called as replum.
Therefore, the correct answer is option A.