If the torque on an object adds up to zero: a) the object could be accelerating linearly but it could not be turning. b) the object is at rest. c) the object cannot be turning. d) the object could be both turning and accelerating linearly. e) the forces on it also add up to zero.

D

Explanation :

Torque adds up to zero therefore the object could both be turning and accelerating linearly.

Torque is zero means that angular acceleration is zero i.e. object is rotating with constant angular velocity.

Even if force is zero, object can move i.e. with a constant velocity.

Thus Zero torque does not implies that object is not rotating.