The disadvantage of interviews is A: "the interviewer may bias subtly the respondent's answers by showing inadvertently approval or disapproval of certain answers".
An interview is a type of qualitative research method that is based on asking questions in order to collect data from the responders. Interviews involve two or more people, one is the interviewer who asks the questions and another is the respondent from whom the interviewer asks the questions.
One of the disadvantages of the interview type of research method is that it can cause biases. For instance, the respondent's answers can be affected by the interviewer's approval or disapproval of certain answers.
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