Syngamy and triple fusion is called ... $A$ ... The central cell becomes ... $B$ ... develops into ... $C$ ... and zygote develops into ... $D$ ...
$A, B, C, D$ in the above statement are

• 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
  $A-PEN, B-endosperm, C-syngamy, D-fertilisation$