(D) The element that can exhibit oxidation states ranging from $+4$ to $+6$ is chromium $(Cr)$.Chromium has an electronic configuration of $[Ar] 3d^5

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(D) The element that can exhibit oxidation states ranging from $+4$ to $+6$ is chromium $(Cr)$.Chromium has an electronic configuration of $[Ar] 3d^5 4s^1$.It can show various oxidation states from $+1$ to $+6$ in its compounds,such as in $CrO_2$ $(+4)$ and $CrO_3$ $(+6)$.