Select the correct option with respect to the chromosome number in the sexual life cycle of an apple $(2n = 34)$.

• A
  Megasporocyte $- 34$; Microspore $- 17$; $PEN - 51$
• B
  Oosphere $- 34$; Nucellus $- 34$; Pollen grain $- 17$
• C
  Meiospore $- 34$; Microspore $- 17$; Embryo $- 34$
• D
  Meiocyte $- 34$; Sporocyte $- 34$; Pollen tetrad $- 34$