Identify $A$ to $D$ in the following diagram.

  • A
    $A$-Filament,$B$-Pollen sac,$C$-Pollen grain,$D$-Line of dehiscence
  • B
    $A$-Filament,$B$-Pollen sac,$C$-Line of dehiscence,$D$-Pollen grain
  • C
    $A$-Filament,$B$-Line of dehiscence,$C$-Pollen sac,$D$-Pollen grains
  • D
    $A$-Filament,$B$-Line of dehiscence,$C$-Pollen sac,$D$-Pollen grains

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