Answer D.
A is a religious institution. B is educational. C is welfare or medicine.
Professor plum is showing the detached style of listening. This type of listener are intellectually not present in a conversation although they are present physically. In the situation described clearly the professor was not listening to what Roberto was saying.
According to A<span>ndrew Cherlin, Americans are faced with the difficulty to commit to one person in his/her lifetime - a term called polyarmous. In actuality, this is not the case for americans only but can also be possible to all nationals. Love is always applicable to all.</span>