A frozen yogurt shop conducted a survey in which it asked every fourth customer for his or her favorite flavor. Most of the customers surveyed preferred vanilla yogurt, so the shop concluded that the customers' favorite flavor is vanilla. Is this a valid conclusion?
A. Yes. Since it was a biased sample, it is most likely representative of the population.
B. No. Since it was a random sample, it is most likely not representative of the population.
C. No. Since it was a biased sample, it is most likely not representative of the population.
D. Yes. Since it was a random sample, it is most likely representative of the population.