The correct option is D Apomictic diploid.
Nucellar embryo is apomictic diploid. Substitution of usual sexual reproduction by a form of reproduction which does not include meiosis and syngamy is called apomixis. In this technique embryo is developed by some other tissue without fertilization e.g., nucellus or integuments or infertilized egg. Nucellus in a diploid tissue so nucellar embryo is apomictic diploid.