A choral conductor has 1275 singers in her choir, some of them are professional singers. The conductor wants to estimate what percentage of singers are professional, but can't ask all 1275, so she instead asks 636 singers in front and finds 18 who are professionals. (a) What specific type of bias does this scenario demonstrate? A. Voluntary response sampling B. Convenience Sampling C. It is representative of the population. D. None of the above. (b) Identify the sample. A. 636 B. singers who were asked C. 18/1275 D. None of the above. (c) Identify the population A. 18/1275 B. entire singers C. percentage of entire singers who are professional D. None of the above. (d) Identify the statistic. A. entire choir members . 1275 . 18/636 D. None of the above.