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What does it mean when a part of the population is​ under-represented?
A. A part of the population is​ under-represented when individuals selected to be in the sample who do not respond to the survey have different opinions from those who do.
B. A part of the population is​ under-represented when it is proportionally smaller in its population than in a sample.
C. A part of the population is​ under-represented when their answers on a survey tend not to reflect their true feelings.
D. A part of the population is​ under-represented when it is proportionally smaller in a sample than in its population.