Well that's why it feels/seems like a question - because it requires a response. He says he wants a D and the unsaid question is "And what do you say to this?". So I feel like I should state my position.
Please argue with me on this, but to me "I know" sounds kinda arrogant, not really validating. Maybe "I see" would be more suitable?
Accept that there is only one thing you can change in life and that is you
