Without my tutor’s help, I couldn’t have made such a good speech

A. Had my tutor not helped me, I couldn’t make such a good speech.

B. If my tutor didn’t help me, I couldn’t make such a good speech.

C. If it hadn’t been for my tutor’s help, I couldn’t have made such a good speech.

D. If my tutor hadn’t helped me, I could have made such a good speech.