The negative sign in the equation for $f_{r}$ says that

the direction of force is sometimes opposite to the direction of body's motion.

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the force is in the same direction to the body's motion.

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the force is in the opposite direction to the body's motion.

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None of these

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Solution

The correct option is C the force is in the opposite direction to the body's motion.
When a body oscillated in air or liquid a friction force $f_{r} = - b v$ acting on the body.T he b depends on the kind of liquid the mass is in and the shape of mass. The negative sign says that the force acting opposite to the direction of motion of a body.

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The negative sign in the equation for fr says that

The negative sign in the equation for $f_{r}$ says that