Test each option against its characteristic states. Manganese ranges from +2 up to +7, scandium is fixed at +3, and zinc — with a full $d^{10}$ core — shows only +2.
$Copper$ is the one element that is stable in both a $+1$ (cuprous) and a $+2$ (cupric) state, so it is the metal exhibiting +1 and +2. Correct option: (C) Cu.