Which of the Following Statements Is Correct

Which of the following statements is correct?

A) The use of Census data is especially useful and cost-effective in targeted marketing.
B) Census data are considered more reliable than data collected via direct consumer surveys because people are more likely to provide accurate responses to government census takers.
C) While the use of census data in targeting marketing can provide relatively accurate information, experience has shown that it has the disadvantage of increasing marketing costs by a substantial amount.
D) While census data are considerably less expensive than data obtained via direct consumer surveys, they are also considerably less reliable.