When a stopper is pulled from a filled wash basin, the water drains out while circulating like a small whirl pool. The angular velocity of a fluid element about a vetical axis through the orifice appears to be greater near the orifice. The angular velocity of fluid element varies

• A

  inversely as the square of its distance from the axis through the orifice.

• B

  inversely as the distance from the axis through the orifice.

• C

  directly as the square of its distance from the axis through the orifice

• D

  directly as the distance from the axis through the orifice