Which from following is a soft metal?

Chromium is a hard metal known for its corrosion resistance and brittleness, while vanadium exhibits hardness with ductile and malleable properties. Cobalt shares similar hardness characteristics as a ferromagnetic transition metal.

Cadmium distinguishes itself as a soft, malleable, and ductile metal with properties resembling tin.

The soft metal among the given options is cadmium, corresponding to choice D.