Answer :
Answer: D) a survey
Explanation: A survey is a method used in obtaining the self-reported attitudes or behaviors of a group of people who represent a population. It is useful when the study has a limited budget and the purpose is to study general trends as this is a cheap method and can cover a large number of people.
The limitations of this technique include the fact that the people surveyed may lie and surveys are usually anonymous, so if another variable is to be considered in addition to the information in the survey, it is impossible to get this new information.