The following graph represents the $T$ - $V$ curves of an ideal gas (where $T$ is the temperature and $V$ the volume) at three pressures $P_1, P_2$ and $P_3$ compared with those of Charles's law represented as dotted lines.
Then the correct relation is:

• A

  $P_1\gtP_3\gtP_2$
• B

  $P_2\gtP_1\gtP_3$
• Correct answer
  C

  $\quad P_1\gtP_2\gtP_3$
• D

  $P_3\gtP_2\gtP_1$

Hence, the correct answer is option: 'C'.