A Local Radio Talk Show Host Asks His Listeners to Call

A local radio talk show host asks his listeners to call in and report how frequently they engage in sexual intercourse. Which of the following BEST describes the validity of this information?

A) Because a random sample of the audience will call in, this will be valid information.
B) Because this is considered a demographically balanced sample, the information will be valid.
C) Because the host is utilizing the experimental method instead of the survey method, the information will not be valid.
D) Because this sample is not representative of the community, it will not be valid.