Which of These Is Not an Advantage of Using a Stratified

Which of these is not an advantage of using a stratified sample instead of a simple random sample?

A) the stratified sample reduces bias
B) the stratified sample reduces sample to sample variability
C) the stratified sample can prevent an unrepresentative sample such as one of all males from a mixed gender population.
D) the stratified random sample allows you to get information about each stratum

Correct Answer:

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