Read the statements $P$ and $Q$:
$P$: The number of mitochondria in each cell does not depend on the physiological activity of the cell.
$Q$: Mitochondria are present in both plant and animal cells.
Select the correct option from the given choices.

• A
  Statement $P$ is true,$Q$ is false.
• B
  Both statements $P$ and $Q$ are true.
• C
  Statement $Q$ is true,$P$ is false.
• D
  Both statements $P$ and $Q$ are false.