Which of the following is a key element of survey methodology?

The correct choice emphasizes the importance of sampling methods and question design as essential elements of survey methodology. Sampling methods determine how participants are selected, impacting the representativeness of the data collected and the validity of the survey's findings. Effective question design is crucial because it influences how respondents interpret questions, affecting the accuracy and reliability of their answers. Together, these aspects ensure that the data gathered is robust and can be generalized to draw meaningful conclusions about the population being studied. Both elements must be carefully considered to produce a well-structured survey that yields useful insights.