Which of the Following Is NOT Given in the Text

Which of the following is NOT given in the text as a problem with using surveys to determine consumer preferences?

A) Subjects are asked to imagine choices that they do not actually face, and few people take hypothetical questions as seriously as they would actual choices.
B) Some people have difficulty forecasting their own behavior.
C) People may answer with what they think they ought to do, not what they think they actually would do.
D) Many people maliciously try to tamper with survey results by giving false answers.