The geometry and dimensions for a section of the blood vessel are shown on the right. Based on the Poiseuille's law the viscous resistance against blood flow through this section is determined to be 0.0002 mmHg•s/ml. If the diameter of the vessel decreases from 2 to 1 cm and everything else is the same, the viscous resistance should become
(A) 0.0004,
(B) 0.0008,
(C) 0.0016,
(D) 0.0032,
(E) none of the above.