Which is the most effective way to correct the fragment in sentence 3

if you don't mind posting the paragraph so i could read it that would a lot. (;

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.

the people of renaissance florence, like most city–states of the era, were composed of four social classes: the nobles, the merchants, the tradesmen and the unskilled workers.

the nobles lived on large estates outside the city walls. they owned most of the city’s land, so the nobles controlled. the nobles served as military officers, royal advisers and as politicians.

baldassare castiglione described the proper manners of a noble in the book of the courtier (1528). castiglione wrote that a noble must have training to be an able warrior and social talents such as wit, the ability to dance, and “a certain grace that makes all his activities seem effortless and unconscious.”

the nobles were disdainful of the merchant class, who gained wealth in industries like wool processing, shipbuilding and banking. the merchants sought to protect their wealth by controlling the government and marrying into noble families. they became patrons of great artists in order to gain public favor.

the tradesmen of florence were the crafts workers and shopkeepers. most tradesmen belonged to guilds, organizations that established standards of quality, set rules for membership, and limited outside competition.

the unskilled workers were the lowest class of city workers. these laborers did not have job protection and were very dependent on their employers. workers who violated rules could have their wages withheld or could be discharged from their jobs.