The master of ceremonies has a very soft voice. Everyone listens to her attentively whenever she appears on the stage.

• A. So soft is the voice of the master of ceremonies that everyone listens to her attentively whenever she appears on the stage.
• B. As long as the master of ceremonies hadn’t had a very soft voice, everyone wouldn’t listen to her attentively whenever she appears on the stage.
• C. Only after everyone listens to the master of ceremonies attentively whenever she appears on the stage does she have a very soft voice.
• D. But for a very soft voice, everyone would listen to her attentively whenever she appears on the stage.