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.
Answer:
C) Incidentally
Explanation:
Personally I don't like any of these answer choices. However, this one makes the most sense in this context. The others would need a much different set-up earlier on in the passage. "Incidentally" does not require such a set up, which is why it is the only one that fits.