A) A-Fusion, B-haploid, C-diploid cell, D-embryo
B) A-double fertilization, B-PEN, C-endosperm, D-embryo
C) A-embryo, B-endosperm, C-PEN, D-diploid cell
D) A-PEN, B-endosperm, C-syngamy, D-fertilisation
Explanation
A-double fertilization, B-PEN, C-Endosperm, D-Embryo