Which of the Following Is Accurate

Which of the following is accurate?

A) The reason that researchers use probability samples is because they guarantee representativeness of the sample.
B) In general, the more heterogeneous a population, the smaller the sample needed for representativeness.
C) A simple random sample is appropriate when a researcher wants to over-represent a characteristic in the population
D) A sample is representative of the population from which it is drawn if the aggregate characteristics of the sample approximate those of the general population.