Statement $S$: The classification system proposed by Woese is called the three-domain system. Reason $R$: Woese divided organisms into three domains: Archaea,Bacteria,and Eukarya.

• A
  Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
• B
  Both $S$ and $R$ are 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.