What does the<br/>author mean by saying “getting on stage is no small achievement<br/>for him”? ( ) A: To play the<br/>violin with three strings is a great challenge. B: It is not easy<br/>for Itzhak Perlman to get on stage. C: To face such a<br/>large audience requires great courage. D: It is not easy<br/>for Itzhak Perlman to make an excellent speech.