Which of the following is a strength of using questionnaires?

Using questionnaires offers a significant strength in the ability to reach large populations quickly. This method is particularly advantageous in research contexts where gathering data from a wide audience is essential. Questionnaires can be distributed easily, whether in printed form, via email, or through online platforms, allowing researchers to access data from numerous individuals in a relatively short period.

This capability enables the researcher to gather diverse perspectives, enhancing the overall validity and reliability of the findings. Moreover, large sample sizes can contribute to more robust statistical analyses, increasing the generalizability of the results to a broader population.

Other answer choices highlight valuable aspects of research methods but don't provide the same overarching benefit. Engaging directly with participants tends to lead to deeper insights, but it is much more time-consuming and resource-intensive. Reducing dropout rates is important when maintaining participant engagement in many research methods, but questionnaires typically do not address the issue effectively. Lastly, achieving 100% response accuracy is unrealistic in any research design, as variations in participant interpretation and possible bias can lead to errors in the data collected. Therefore, the main advantage of questionnaires lies in their efficiency and capacity to cover extensive populations.