问题详情

Which of the following is more likely to be the source for problems in this survey？
A．This survey is tilted in favor of local alcohol distributors, who have a conflict of interest with online sellers.
B．The data collection and analysis are not scientific and logical.
C．Subjects are not sampled in a right way and can not represent the whole American teenage population.
D．The survey results are affected by gifts to subjects, which can be misleading.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！