The correct option is B Marginal
A)Axile placentation is observed in tomato, lemon etc in which ovules are attached to it in a multilocular ovary.
B)Marginal placentation occurs in pea, gram etc in Leguminosae family the placenta forms a ridge ventral suture of the ovary and the ovules are born on the ridge form two rows.
C)Parietal placentation occurs in mustard in Brassicaceae family and the ovule develop on the inner wall of the ovary or on a peripheral part.
So the correct option is 'Marginal'