The correct option is
D Endosperm; Cotyledon
Maize is a monocot seed i.e., it contains only one cotyledon.
- A is Endosperm- responsible for the nourishment and protection of the developing embryo.
- B is Cotyledon- responsible for the nourishment of young seeds.
![](https://search-static.byjusweb.com/question-images/byjus/ckeditor_assets/pictures/1004637/original_Dia_28.3.png)