I believe it would be C. line. A column is used to hold up structures, and they always stand up straight. So yes, line is your answer
I think it's the 3rd sentence because belligerent means hostile and aggressive.
The first word in a quotation that is a complete sentence is capitalized, but the first word in a partial quotation is not: He said, “Life is just one d*mned thing after another.”
Passed away is a very common way to say that someone has died
