The Frictional force is 99 N; option C.
The frictional force between the floor and the surface is calculated as follows:
Frictional force = coefficient of friction * normal reaction
Frictional force = 660 * 0.15
Frictional force = 99 N
In conclusion, the frictional force is determined from the coefficient of friction and the normal reaction of the box on the floor.
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