Phrases Phrases for Complaining Politely

I'm afraid I have to disagree.

Meaning

Politely disagreeing with someone.

Translation language

John: I think we should proceed with option A.
Alice: <b>I'm afraid I have to disagree</b>. Option B seems more viable.
John: Could you explain your reasoning?
Alice: Of course. Let me show you the data. But if you're set on option A, I'll explain again why <b>I'm afraid I have to disagree</b>.