Determine whether the sampling method described below appears to be sound or is flawed In a survey of 577 human resource professionals, each was asked about the importance of the appearance of a job applicant. The survey subjects were randomly selected by pollsters from a reputable market research firm. Choose the correct answer below. O A. It is flawed because it is a voluntary response sample. O B. It is flawed because it is not statistically significant. O C. It appears to be sound because the data are not biased in any way. O D. It is flawed because it is a census