Why do closed-ended questions tend to boost the response rate of questionnaires?

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Because the questions are phrased in a straightforward mannerSince they include prepaid return postageAs the response choices do not overlapDue to their simplicity and speed in answeringBecause respondents do not need to think before answering

Explanation

Closed-ended questions increase questionnaire return rates primarily because they are simple and quick for respondents to complete, making it easier and less time-consuming to provide answers.