Which revision correctly uses. suborning conjunction to combine a sentence

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."

explanation:

ward, and charles cooley, felt that social conflict was a process that should be in exploring social processes and social problems. conflict as a functional social process." 

the answer is a because the astrophel does more and sidney goes to the astrophel more than stella.