Answer: B. Population.
Explanation: Population may be explained from a statistical view to consist or incorporate all individuals or participants who is eligible and fits a certain research criteria within the research setting. For instance, a population of college students in New York city should consists of all students attending colleges in the New York. Hence it can be deduced that, population is a set of all eligible participants. It is from these population that sample is being drawn from which is a random subset of participants which is representative of the entire population.