Answer:
The answer is D. structured interview.
Step-by-step explanation:
In a structured interview, the researchers or interviewers ensure that every interview is done exactly the same way; same questions and same order. This type of interview is mostly quantitative, this is, it records numerical data.
The advantage of this type of interview is that the data can be objectively analysed and compared to others, and for this reson increases the reliability of the results.