Determine whether the sampling method described below appears to be sound or is flawed. in a survey of 714 subjects, each was asked how often he or she read a book. read a book. the survey subjects were internet users who responded to a question that was posted on a news website.
a) it is flawed because it is a census
b) it is flawed because it is not statistically significant.
c) it appears to be sound because the data are not biased in anyway.
d) it is flawed because it is a voluntary response sample.