$S$: The Amorphophallus (Ramban) has a large inflorescence of about $6 \ m$ height.
$R$: Rafflesia arnoldii has the largest flower,weighing about $8 \ kg$ and having a diameter of about $1 \ m$.

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