If $P$ represents radiation pressure,$c$ represents the speed of light,and $Q$ represents radiation energy striking a unit area per second,then non-zero integers $x, y,$ and $z$ such that $P^x Q^y c^z$ is dimensionless are:

  • A
    $x = 1, y = 1, z = -1$
  • B
    $x = 1, y = -1, z = 1$
  • C
    $x = -1, y = 1, z = 1$
  • D
    $x = 1, y = 1, z = 1$

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