I see no necessity for 'qualitative' to be the answer; 'quantitative' and 'valuable' would fit as well. It is a poorly-written question.
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Hasibul Alam(A) Quantitative means "of or about numbers or measurement." There is no reason to expect open-ended interviews to produce quantitative data.And there is no reason to expect that they will not.
Hasibul Alam(B) Implicit means "unstated or logically implied." Neither meaning has a necessary relationship with open-ended interv