71st with reason

​Q71. The coefficient of viscosity ( η ) of a liquid by the method of flow through a capillary tube is given by the formula  η π     R     P 8     l     Q
  where R = radius of the capillary tube, 
             l = length of the tube and 
             P = pressure difference between its ends, and 
             Q = volume of liquid flowing per second.
     Which quantity must be measured most accurately?

        (A) R                          (B) l                     (C) P                     (D) Q

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