I think Death but i could be wrong
C. Suzie, my best friend, is also an amazing athlete.
It is the sentence that does not contain any errors in comma usage.
Usage of commas
1) to separate items in a series
2) to separate coordinating adjectives
3) to separate two independent clauses (compound sentence)
4) to separate the introductory words from the independent clause.
5) to separate nonessential words, phrases, and clauses
* All choices contain an "appositive". An appositive renames the subject.
My best friend is an appositive for Suzie.Thus it is enclosed by commas to separate it from the rest of the sentence.
As such, the mafia is a counterculture.
Take into consideration the counterculture of the 60s - the hippie culture who opposed wars and fought the government in a peaceful way. They wanted to change the society for the better by opposing those in power. Mafia, on the other hand, opposes the entire society, but is still an example of counterculture.