The correct option is
D Pericarp is fused with seed coat
Organically, an oat grain, for example, corn, rice, or wheat, is likewise a sort of natural product, named a caryopsis. Be that as it may, the natural product divider is thin and is intertwined to the seed coat, so the majority of the consumable grain is really a seed.
So, the correct option is 'Pericarp is fused with seed coat'.