A major limitation of the postal questionnaire survey is

ANeed for supplementary questions

BAvailability of extra data

CNeed for a covering letter

DHigher rate of non-response ✓ Correct

Correct answer: (D) Higher rate of non-response

Explanation

A major limitation of the postal questionnaire survey is its higher rate of non-response.

Many mailed forms are never returned, shrinking and biasing the sample.

The need for supplementary questions is not its defining drawback.

Availability of extra data would be a benefit, not a limitation.

Needing a covering letter is a minor practical requirement, not a major flaw.

Non-respondents may differ systematically from those who reply.

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