Notice that work, kinetic energy and power are all scalar quantities.
Nevertheless, weight can also refer to the weight vector, since the weight is a force (its magnitude is a scalar).
On the other hand, work and power can assume negative values, since the sign represents whether the energy is going in or out from a system.
Therefore, the only scalar quantity that is never less than zero among the given options, is:
[tex]c)\text{ Kinetic energy}[/tex]