Her parents supported and encouraged her. She did a great performance in the contest.

A. If her parents had given support and encouragement, she could have done such a great performance in the contest.

B. If her parents had supported and encouraged her, she couldn’t have done a great performance in the contest.

C. If her parents hadn’t supported and encouraged her, she would have done a great performance in the contest.

D. Had it not been for her parents’ support and encouragement, she couldn’t have done such a great performance in the contest.