How does interpreting information using text features contribute to an understanding of the text?

question

will give

you will find groups such as germans, acadians, irish/scots, french, spanish, anglo/americans, african americans, and native americans. you are looking for the contributions that each of these groups provided to the settlement of louisiana.

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.