The correct option is
A Basal - Marigold
In the basal placentation, there is unilocular ovary and the ovule is located at the base of the ovary. This type of placentation is seen in the disc florets of the members of the family Asteraceae, for example, Marigold.
A. Basal is seen in Marigold.
B. Free central is seen in Dianthus, Silene.
C. Parietal is seen in Brassica, papaya.
D. Axile is seen in tomato, citrus.
E. Marginal is seen in pea.
Hence, the correct answer is 'Basal-Marigold'.