[单项选择]According to reports in major news outlets, a study published last week included a startling discovery: the nation’s Jewish population is in shrinking. The study, the National Jewish Population Survey, found 5.2 million Jews living in the United States in 2000, a drop of 5 percent, or 300,000 people, since a similar study in 1990．What’s truly startling is that the reported decline is not true. Worse still, the sponsor of the $6 million study, United Jewish Communities, knows it.
Both it and the authors have openly admitted their doubts. They have acknowledged in interviews that the population totals for 2000 and 1990 were reached by different methods and are not directly comparable. The survey itself also cautions readers, in a dauntingly technical appendix, that judgment calls by the researchers may have led to an undercount. When the research director and project director were asked whether the data should be construed to indicate a declining Jewish population, they flatly answe
A. It found a decline of 300,000 Jews in ten years.
B. It was carried out by United Jewish Communities.
C. This is the first time United Jewish Communities has made mistakes in the population survey.
D. The reported decline is not reliable.