Which of the following statements is not correct ?

Options

A. Copper liberates hydrogen from acids.
B. In its higher oxidation States, manganese forms stable compounds with oxygen and fluorine.
C. `Mn^(3+)` and `Co^(3+)` are oxidising agents in aqueous solution.
D. `Ti^(2+)` and `Cr^(2+)` are reducing agents in aqueous Solution.