We sang two lines each and sang the chorus together . Q. You ' ve performed in numerous large - scale concerts throughout your career , but is n't this your first time performing in front of 90,000 audience members and billions of TV viewers ? A. I performed in front of 40,000 audience members during my Beijing concert .

Question: Why did the singer perform in front of 40,000 audience members ?
Answer: Because they sang the chorus together .None of the above choices .Because they performed in front of billions of TV viewers .Because they are a popular and talented singer .