Final answer:
A) Population
The unit of sampling relates to the population, which is the entire group the researcher wants to draw conclusions about.
Step-by-step explanation:
The unit of sampling is always related to the entity about which the researcher is drawing conclusions. The correct answer is A) Population, as this term refers to all members who are affected by the research, such as all college students in the scenario provided. A sample is a subset of the population like the 100 college students in the study, and it represents the larger population. Experimental units are individuals in the study, in this case, each college individual participant. Variables can be explanatory, which explain changes in the response variable, like how the size of tableware might affect the amount of food eaten.