In the process of screening, the screen are inclined at $$45^\circ$$,the area of openings in screen should be suchthatthe velocity of flow through them doesnot exceed,

A

0.75 to 1.0 $$\frac{m}{s}$$

B

1.5 to 3.0 $$\frac{m}{s}$$

C

3.0 to 5.0 $$\frac{m}{s}$$

D

5.0 to 6.0 $$\frac{m}{s}$$