Answer is D.
Desert and tundra regions are marked by their absence of trees, which indicates little to no rainfall in the area.
My personal opinion to what the answers are:
Readers are uneasy with the narrator's growing instability,
Readers question the narrator's ability to act rationally,
Readers understand that the account given by the narrator is true.
I hope this helped, again, this is only my opinion to what I believe the answers are.
The second one is the answer for this question
Conjunction, “If” is a conjunctional term that begins a sentence with a dependent clause
