The correct option is B.
There are two basic types of interview, structured and unstructured interview. In unstructured interview, the conversation is allowed to flow freely.
A structured interview refers to a fixed format form of interview in which questions are prepared and arranged in certain order prior to the interview and all the respondents are asked the same questions in the same order. This type of interview provides required precision that is required in certain situations. Structured interview is usually used as a quantitative research method in survey research. <span />
I think it was well written because the concept seems interesting in itself that people could go back in time or into the future. Albert Einstein has a better theory though
I'd probably say c. because the other options don't make too much sense.
