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# A block rests on a rough inclined plane making an angle of $30^{\circ}$ with the horizontal. The coefficient of static friction between the block and the plane is $0.8$. If the frictional force on the block is $10\; N$, the mass of the mass of the block (in kg) is (take $g=10\;m/s^2$)

( A ) $4.0$
( B ) $1.6$
( C ) $2.0$
( D ) $2.5$