IIT JEE 2009 P1 Q46

A block of base 10cm x 10 cm and height 15 cm is kept on a inclined plane. The coefficient of friction between them is √3. The inclination θ of this inclined plane from the horizontal plane is gradually increased from 0°. Then

A) at θ=30° The block will start sliding down the plane
B) the block will remain at rest on the plane upto acertain θ and then it will topple
C) at θ=60°, the block will start sliding down the plane and continue to do so at higher angles
D) at θ=60°, the block will start sliding down the plane and on further increasing θ will topple at certain θ