The figure below shows a vertical section of a flower. Identify the parts $P, Q,$ and $R$.
$\quad \quad P \quad\quad Q\quad\quad R$

• A
  Sepal $\quad$ Petal $\quad$ Anther
• B
  Sepal $\quad$ Petal $\quad$ Stigma
• C
  Petal $\quad$ Sepal $\quad$ Anther
• D
  Petal $\quad$ Sepal $\quad$ Stigma