28. For the oxides CrO, Cr₂O₃, and CrO₃, which of the following is true?
(A) CrO is acidic, and Cr₂O₃ and CrO₃ are basic.
(B) CrO and Cr₂O₃ are acidic and CrO₃ is basic.
(C) CrO is basic, Cr₂O₃ is amphoteric, and CrO₃ is acidic.
(D) All the oxides are acidic.
(E) All the oxides are basic.

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