I cannot send her the invitation because I don't know her address.
Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to the original sentence in each of the following questions.
I cannot send her the invitation because I don't know her address.
A. If I know her address, I can send her the invitation.
B. I couldn't send her the invitation if I didn't know her address.
C. If I knew her address, I would send her the invitation.
D. I could have sent her the invitation if I had known her address.