During agitation of liquids, the

A. Froude number is independent for the curves between power number and Reynolds number in baffled system

B. Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller

C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

D. All of the above

Answer: Option D