In Which of the Following Surveys Should You Place the Most

Multiple Choice

In which of the following surveys should you place the most trust?

A) a survey by a large oil company that shows its product is better than that of other companies
B) a telephone survey by a weekly newspaper that indicates prison reform is necessary
C) a university study by known sociologists that concludes welfare payments are insufficient
D) a woman's magazine survey that questions its subscribers about drug use by housewives