I’m sure that she didn’t kill him because she was with me at the supermarket when the murder happened.
A. She mustn’t have killed him because she was with me at the supermarket when the murder happened.
B. She needn’t have killed him because she was with me at the supermarket when the murder happened.
C. She can’t have killed him because she was with me at the supermarket when the murder happened.
D. She shouldn’t have killed him because she was with me at the supermarket when the murder happened