$O$ is the origin and $A$ is the point $(3,4)$. If a point $P(x,y)$ moves such that the line segment $OP$ is always parallel to the line segment $OA$,then the equation of the locus of $P$ is:

  • A
    $4x - 3y = 0$
  • B
    $4x + 3y = 0$
  • C
    $3x + 4y = 0$
  • D
    $3x - 4y = 0$

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