A news release for the diet products company reports: "There's good news for 65 million Americans currently on a diet." Its own study showed that people who lose weight can keep it off. The sample was 20 graduates of company's program who endorsed program in commercials. The results of sample are probably
A. biased, overstating the effectiveness of the diet.
B. biased, understating the effectiveness of the diet.
C. unbiased since the people in the sample are nationally recognized individuals.
D. unbiased, but they could be more accurate. A larger sample size should be used.