The first one seems to be the best choice for me too
Figurative language is where it’s not literally like say my head is going to explode that would be figurative because your head wouldn’t explode unless you put a gun or have explosives and I don’t know about the other question so sorry about that.
The theme can be, a man is alone in the cold Yukon with nothing but a dog, and all odds are against him, including nature. A theme is an outline of the story by not getting into details
When an author carefully chooses her words, she is using Diction. Diction are emotionally-charged words which the author chose herself