The diagram of the section of a maize grain is given below. Identify the parts labelled $A$,$B$,$C$ and $D$.

• A
  $A$-endosperm,$B$-coleoptile,$C$-scutellum,$D$-aleurone layer
• B
  $A$-endosperm,$B$-coleorhiza,$C$-scutellum,$D$-aleurone layer
• C
  $A$-endosperm,$B$-cotyledon,$C$-scutellum,$D$-aleurone layer
• D
  $A$-cotyledon,$B$-coleoptile,$C$-scutellum,$D$-aleurone layer