GKFix MCQ Question

Why does the text mention MnO₃F in the context of Manganese's +7 oxidation state?

• A. To show that MnF₇ is stable
• B. To prove that +7 is the highest state for Mn
• C. To show that the +7 state exists but not in simple binary halides
• D. To compare it with CrF₆