C
Statistician: A financial magazine claimed that its survey of its subscribers showed that North Americans are more concerned about their personal finances than about politics. One question was: "Which do you think about more: politics or the joy of earning money? " This question is clearly biased. Also, the readers of the magazine are a self-selecting sample. Thus, there is reason to be skeptical about the conclusion drawn in the magazine' s survey. Each of the following, if true, would strengthen the statistician's argument EXCEPT:
A: Other surveys suggest that North Americans are just as concerned about politics as they are about finances.
B: The conclusions drawn in most magazine surveys have eventually been disproved.
C: Other surveys suggest that North Americans are concerned not only with politics and finances, but also with social issues.
D: The credibility of the magazine has been called into question on a number of occasions.