Statement-$I$: The anatomical setup of the lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity.
Statement-$II$: The volume of air remaining in the lungs even after a forcible expiration is called residual volume.

• A
  Statement $I$ and $II$ both are correct.
• B
  Statement $I$ and $II$ both are incorrect.
• C
  Statement $I$ is correct but statement $II$ is incorrect.
• D
  Statement $I$ is incorrect but statement $II$ is correct.