Which of the following statement is wrong?

• A

  Metals in highest oxidation states are more stable in oxides than in fluorides.
• Correct answer
  B

  All elements of \( 3 d \) series exhibit variable oxidation states.
• C

  In highest oxidation states, the transition metals show acidic character.
• D

  \( M n^{3+} \) and \( C o^{3+} \) are oxidizing agents in aqueous solution.

Hence, the correct answer is option: 'B'.