The Marketing Researcher for a Game Company Is Conducting an Experiment

The marketing researcher for a game company is conducting an experiment to test customer reaction to the pricing of a new game designed for use by adults.A list of customers who had sent the company complaint letters was readily available, and the researcher rearranged this list by ZIP code, sending every third person a color brochure on the new game.Each respondent was asked to return a postcard, stating an intention to purchase or not to purchase the game at the listed price.Which of the following is true?

A) The sampling method ensures that all geographic areas are represented.
B) The external validity of the study is ensured, since respondents who are sitting in their homes are reacting under real life
Circumstances.
C) The sample is likely to over-represent the lower class.
D) The design of the study suffers from selection bias.
E) None of the above.