$A$ gas satisfies the relation $P V^{5/3} = K$, where $P$ is pressure, $V$ is volume, and $K$ is a constant. The dimensions of constant $K$ are:

• A
  $ML^4T^{-2}$
• B
  $ML^2T^{-2}$
• C
  $ML^6T^{-2}$
• D
  $MLT^{-2}$