I think you have to give the definitions that should be easy to find with a quick google search ;)
Answer:
Can you send an image of the question?
Answer:
C
Explanation:
This title is the most appropriate because it does not limit research to a narrow question, but rather asks a series of essential questions.
Much research will have to go into the three questions of how, when, and why doughnuts became popular, but ultimately all these questions will help reveal the beginnings of a popular food item in the modern United States.