Why is it helpful to know for certain that we will experience some level of anxiety before making a public speech?
选项：

A:Because we then will use the energy of our anxiety to produce a good speech.;
B:Because we then can go to see a doctor for some remedy in time.;
C:Because we then may use this as an excuse to avoid the situation.;
D:Because we then can hyperventilate to help alleviate the fear.