What is represented by $X$ and $Y$ in the given diagram?

• A
  $X$ - Plumule,$Y$ - Radicle
• B
  $X$ - Endosperm,$Y$ - Pericarp
• C
  $X$ - Coleoptile,$Y$ - Aleurone layer
• D
  $X$ - Seed coat + fruit wall,$Y$ - Endosperm