The correct option is D a - perigynous, b - perigynous
Based on the position of calyx, corolla and androecium in respect of the ovary on thalamus, the flowers are described as hypogynous, perigynous and epigynous. If gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level, it is called perigynous. The ovary here is said to be half inferior, e.g., plum, rose, peach. In both a and b, the ovary is in the centre and all other floral appendages are at the same level on the rim of the thalamus representing the perigynous condition.