Identify the parts of the pistil labeled as $P$,$Q$,and $R$:
Receptive surface for pollen grains $- P$
Elongated slender part of the pistil $- Q$
Basal swollen part of the pistil $- R$
$\quad\quad\quad\quad P \quad\quad\quad Q \quad\quad\quad R$

• A
  Stigma $\quad$ Style $\quad$ Ovary
• B
  Style $\quad$ Stigma $\quad$ Ovary
• C
  Stigma $\quad$ Ovary $\quad$ Style
• D
  Style $\quad$ Ovary $\quad$ Stigma