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.
Answer:
Magma rises to the crust to the earths surface over millions of years
Explanation:
No one ever sees it bc it happens over million of years
Laertes I think I'm not sure
A. Concrete
Janice Mirikitani uses concrete language to convey the universal theme of the suffering of war in “Attack the Water.
Answer:the least 1
Explanation:
At least one depending on hand writing
