Answer:
In my opinion I think maybe B
Am I suppose to buy gifts for them
The abstract noun is C. Loyalty
The answer is on the first part; Opening of the Interview. The first part in doing an interview is crucial because this is where you'll establish rapport by giving the purpose of the interview and outlining what the interview is all about. Giving the purpose of the interview also allows to interviewee to be prepared in the next parts of the interview.
I think you need to read the thing on the guy