A metal plate of area $2m^2$ is pulled horizontally with a velocity of 0.5 m/s on a 1 mm thick liquid layer. If the viscosity of liquid is $1.2N-s/m^2,$ the force required to pull the plate is

• A

  1.2 N

• B

  12 N

• C

  120 N

• D

  1200 N