I regret behaving so impolitely with her and she was disappointed.
A. Unless I behave so impolitely with her,she would not be disappointed.
B. Provided that I did not behave so impolitely with her, she would not be disappointed.
C. I wish I did not behave so impolitely with her.
D. If I had not behaved so impolitely with her, she would not have been disappointed.