The velocity distribution for flow overa flat plate is given by $$U = \left(\frac{3}{4}\right)y - y^2$$ in which u is the velocity in m/s at a distance y meter above the plate. If the dynamic viscosity of the fluid is 10 poise, then the shear stress at 0.2 m is

A

0.45 N/m$$^2$$

B

0.35 N/m$$^2$$

C

0.55 N/m$$^2$$

D

0.25 N/m$$^2$$