Click on all of the words that have a prefix that means "not." unused
prepare
overdue
prepaid
unmade
overpriced

the answer to "what does the narrator realize by the end of the story" is b.

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.