Statement $X$: $Hibiscus$ $rosa-sinensis$ was placed in $Thalamiflorae$ by $Bentham$ and $Hooker$.
Statement $Y$: It possesses a cup-shaped thalamus and its petals are fused.

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