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Let F be the force acting on a particle ...

Let F be the force acting on a particle having position vector `vec( r )` and `vec(tau)` be the torque of this force about the origin, then

A

`vecr. vec tau = 0 and vec F. vec tau = 0`

B

`vec r . vec tau ne 0 and vec F.vectau ne 0`

C

`vec r.vectau ne 0 and vecF.vectau =0`

D

`vecr.vecta ne 0 and vecFxxvectau =0`

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