Assertion $(A)$: The domain $Eukarya$ is divided into five kingdoms.
Reason $(R)$: The three-domain system of classification was proposed by $Carl$ $Woese$.

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