Match the List-$I$ with List-$II$:

List-$I$	List-$II$
$A$. Triatomic rigid gas	$I$. $\frac{C_P}{C_V} = \frac{5}{3}$
$B$. Diatomic non-rigid gas	$II$. $\frac{C_P}{C_V} = \frac{7}{5}$
$C$. Monoatomic gas	$III$. $\frac{C_P}{C_V} = \frac{4}{3}$
$D$. Diatomic rigid gas	$IV$. $\frac{C_P}{C_V} = \frac{9}{7}$

Choose the correct answer from the options given below:

• A
  $A-III, B-IV, C-I, D-II$
• B
  $A-III, B-II, C-IV, D-I$
• C
  $A-II, B-IV, C-I, D-III$
• D
  $A-IV, B-II, C-III, D-I$