The answers would be "He sells some magazines" or "He decides he wants to be a writer.", since Gumption means to be resourceful or have spirited initiative.
The correct sentence is "facts and opinions are not necessarily in opposition". That is so because one can agree with a fact.
On the other hand "fact" may not be a synonym of "opinion". In research you can use "facts", "opinions" or both. It is so because one does not exclude the possibility of using the other. They are not necessarily anthonyms/ opponents. an opinion is not more important than a fact, but on the contrary, because facts can be proved easier than opinions.
I haven't read the book,
Apologies
I would assume that the author does this to show how indifferent the person in the book is, she/he doesn’t know what they are in life, this makes it relatable to readers who have had this feeling before and it shows how the character is feeling in that moment
