Answer:
Recoding the interview without asking for the permission..
Step-by-step explanation:
Recording an interview is helpful for the researcher to always go back to what exactly interviewee said. This helps in the clarification and also develops accuracy.
But, the most important thing before recording an interview is to always ask the interviewee permission. Ethically (in some places legally) it is always good to ask for the permission to record the interview. Sometimes people may not be comfortable being recorded so it is good to ask for their consent.
In the given scenario, the researcher made the mistake of not asking for the consent of the interviewee to record the interview. As is states that the researcher just sat and hit the record button, it does not mention that the researcher took permission.
So, the correct answer is that the researcher did not take the permission to record the interview.