The correct option is
D Inflorescence
A. Thalamus is the swollen, basal part of the pedicel or the stalk.
B. Fruit is the presence of flowering plants or the angiosperms. After fertilization, the ripened ovary or mature ovary is called fruit.
C. The inflorescence is the arrangement of flowers on the floral axis of the plant. Hypanthodium is fleshy receptacle forming a hollow cavity with an apical opening called ostiole. The example is ficus.
D. The ovary is the basal swollen part of the carpel and female reproductive organ.
So, the correct answer is 'Inflorescence'.