A block (of cross section 4 $$\times$$ 3 m size) of 20 kg mass rests on a flat horizontal surface as shown in figure below. If the coefficient of friction between the block and the surface is $$\frac{1}{4}$$, the force ‘F’ which will cause block to move is approximately given by

A

20 kgf

B

10 kgf

C

5 kgf

D

8.7 kgf