The most effective type of research question is related to finding the reasons for the involvement of the US country in World War I.
Option C is the correct answer.
What is a research question?
A research question is an act of examining a problem in order to solve it. it must be well-researched and well-explained.
The research question is considered to be effective when it has original information, in-depth research from varied sources, and an appropriate explanation. It is not just a one-line answer rather it contains an answer which is based on good research about that particular question.
Therefore, the findings of the reasons for the involvement of the US country in the war need to be researched well, that's why it is the most appropriate option.
Learn more about the research question in the link:
https://brainly.com/question/25655057
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