Final answer:
The population refers to the whole group of individuals that the researcher wants to study, while the sample is a smaller representative group of the population that participates in the study.
Step-by-step explanation:
The population refers to the whole group of individuals that the researcher wants to study, while the sample is a smaller representative group of the population that participates in the study.
For example, if a researcher is interested in studying college students, the population would be all college students, while the sample would be a subset of college students selected to participate in the study.
Therefore, the correct answer is (a) Population; Sample.