Copper Plays a Vital Role as a Trace Mineral for Biological

Copper plays a vital role as a trace mineral for biological processes, including the electron transport chain and collagen synthesis.  The Pourbaix diagram below outlines the relationship between several copper species as a function of solution pH and applied potential.  Which statement accurately describes the chemical changes shown in this diagram?

A) The predominant species at a potential of −0.2 V and pH of 13, is CuO.
B) Cu²⁺ is reduced and precipitates as Cu₂O as pH increases to a pH of 8 at a potential of +0.3 V.
C) Cu is reduced to Cu²⁺ as the potential is changed from −0.4 to +0.2 at a pH of 4.
D) The equilibrium between Cu²⁺ and CuO is independent of applied potential above +0.3 V at a pH of 7.

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