D. Uranium is not renewable and we cannot create more.
Answer:
Case study
Explanation:
A case study is a kind of study used in social sciences in which the researcher observes an individual/group/event in a very in-depth manner. Case studies give a lot of information about the person or group who is being studied and let the researcher make causal inferences (because of the in-depth observation) and the researcher gets a better understanding of the situation.
In this question, the psychologist faces an ethical dilemma of needing to remove a potentially beneficial treatment. However, using a case study, she wouldn't need to do so because she could observe the autistic child in his environment without changing it, because the case study is an observing explanatory study. Therefore, the ethical dilemma would be eliminated and she could draw conclusions from the study.
An organizational unit broadly corresponding to a city ward or a Spanish “barrio”
This is the kind of concept a utilitarian would agree on. If the result is positive for a large group of people, we should seriously consider doing it.
However, I would like to comment on this concept. In my opinion (and that's what you're asking for) there are situations in which the ends don't justify the means. You can e.g. think about mass-bombings to fight against terrorism. However, the possibility exists that innocent people will be hit, and will die. Therefore, the end don't always justify the means (in my opinion).