$A-$ The human digestive system consists of the alimentary canal and the associated glands.
$R -$ Liver,pancreas,and salivary glands are associated digestive glands.

• A
  $A$ and $R$ both are correct.
• B
  $A$ and $R$ both are incorrect.
• C
  $A$ is correct and $R$ is incorrect.
• D
  $A$ is incorrect and $R$ is correct.