Which Statement Is True Regarding the Selection of Subjects for a Survey

Which statement is true regarding the selection of subjects for a survey?

A) Generalization to the larger population will be fairly accurate, regardless of the way the sample has been chosen.
B) The sample should contain important subgroups within the population the same proportions as they are found the larger population
C) The most accurate surveys are those with the largest number of subjects.
D) If the sample is relatively large, it need not be representative.