Discussion
When a survey is spread over a vast area and the respondents are educated, what kind of method of enquiry you choose ?
Answer: B
The suitable method is the mailed questionnaire.
When respondents are spread over a vast area, personal interviews and observation become costly and slow. If the respondents are educated, they can read and answer a questionnaire on their own, so sending it by post (or now by email) reaches all of them cheaply.
Personal enquiry, direct observation and focused interviews all require the investigator to meet respondents, which is impractical over a wide area.
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