I believe the answer is: stereotype threat
stereotype threat refers to a prejudice that being targeted toward a certain member of a social group that could prevent those people from achieving their goals in society. Examples of a stereotype threat are: Girls are worse than boys at science, Men who are not physically strong are unworthy, etc.
I believe the answer is :Random sampling
Random sampling refers to select a group of subjects that could be used as sample for a research from a large population. The selection is beind done without any criteria in hope that the sample at least represent the general composition of the population.
The answer would be the third answer
What do you mean by this ?