Statement $(X)$: Endosperm is formed before fertilization.
Statement $(Y)$: Double fertilization is observed.

• A
  Statements $(X)$ and $(Y)$ are both true,but $(Y)$ is not the correct explanation for $(X)$.
• B
  Statements $(X)$ and $(Y)$ are both true,and $(Y)$ is the correct explanation for $(X)$.
• C
  Statements $(X)$ and $(Y)$ are both false.
• D
  Statement $(X)$ is true and Statement $(Y)$ is false.