If everyone in the population has an equal chance of inclusion in a study, then one would say that the study used a Random sampling technique for the study. (Option A.)
The way in which we select a sample of individuals to be research participants is critical. Random sampling makes sure of the population which has to be random and need not be pre determined . The procedure we plan to implement will determine if we are biased or not , if the people know each other or not etc.
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A young lady of property is a noun.