Hypanthodium is

Explanation :- 

Thalamus  is the basal swollen part of a flower on which flower whorls are arranged.

Fruit is a mature ripened ovary.

Inflorescence is the positioning of flowers on the plant.

Ovary is the basal swollen part of the female reproductive system in plants.

Final answer :- 

The correct option is inflorescence, i.e option (C)