Keywords if i'm not mistaken. Length has nothing to do with the type, headings could but not as much as key words, nor does the title.
B) the reason for writing
“We can’t tell them anything”, I said, without thinking.
This is proper because when a person says something in the novel these (“”) must be used to isolate their words.
Look at this example as well:
According to Abraham Lincoln, “America will never be destroyed on the outside”. This means _________
I think that it would be fragment but I am not sure.