单选题 How does the author like the common principle held in the pre-election poll?

A、 It was successful because it took all sections of the population into consideration.
B、 It was successful because the publications sent out numerous questionnaires.
C、 It was unsuccessful because it didn't take the composition of the electorate into consideration.
D、 It was unsuccessful because it put emphasis on quality instead of quantity.

【正确答案】 C

【答案解析】[解析] 第一段第二句指出在盖洛普民意调查之前的那些调查仅依靠数量而非质量，且并未涉及全国人口的各个方面。故选C。D项与此内容正相反。A项描述的是盖洛普民意调查的特点。B项描述的是以前民意调查采取发放问卷的方式，但这并不能证明那时候的调查很成功。