Determine whether the sampling method described below appears to be sound or is flawed. In a survey of 729 ​subjects, each was asked how often he or she played sports. The survey subjects were internet users who responded to a question that was posted on a news website. Choose the correct answer below. A. It appears to be sound because the data are not biased in any way. B. It is flawed because it is a census. C. It is flawed because it is a voluntary response sample. D. It is flawed because it is not statistically significant.