What comparison can be made between the two selections? A.
They both address America's dealings with foreign countries.
B.
They both are critical of the President.
C.
They are both opinion pieces.
D.
They are both unbiased pieces of journalism.

the correct answer is:   [c]:

                    →     " leave it out. "  

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- "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)."

i cannot see any of the options