Answer:
Here is the answer lol Define powerful nations in a risky act .
Explanation:
Because they believe Sirius Black is there.
That is a full answer on your question hope it helps
I would say the correct answer is that has an undetermined answer.If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
