First one is A, second one is B
Answer:
B. He noticed the musty odor of each page as he carefully turned it over.
Explanation:
Musty is a word that can be used in a sentence which contains the sense of smell
I am certain your answer is 4.
To me, it makes the most sense and I think anyone else can agree.
Hope I helped, and good luck!
A narrator may be unreliable because he or she is biased and states their opinion instead of fact.