Statement $X$: In gymnosperms,the endosperm is formed before fertilization.
Statement $Y$: In angiosperms,double fertilization is observed.

• A
  $X$ and $Y$ are both true,but $Y$ is not the correct explanation of $X$.
• B
  $X$ and $Y$ are both true,and $Y$ is the correct explanation of $X$.
• C
  $X$ is true and $Y$ is false.
• D
  $X$ is false and $Y$ is true.