If the torque on an object adds up to zero the object could be both turning and accelerating linearly.
If the net torque acting on the system is zero, the net force may or may not be zero.
The net torque on the Object is zero implies that the Object cannot have an angular acceleration
but it will have an angular velocity. Thus, the object will rotate. The center of mass of the object
will have the linear acceleration since because there will be a net force. Thus, the correct option
is the object could be both turning and accelerating linearly.