The most likely options are the second and last choices. I am leaning toward the second choice, though.
C would be the correct answer in this case as A could be plausible but they aren't always used to simply. They're more of a means of expression like an article in a newspaper.
C is the correct answer.
Answer:
germany's invasion of poland
Explanation:
Hello! The answer to your question would be as followed:
The process of becoming a US citizen when you are not born in the united states or to parents who are US citizens is called <u><em>"The Naturalization Process"</em></u>