Final answer:
The song that refers to cop killing and boasts about illegal activities is "Straight Outta Compton" by N.W.A, which is distinct from the other options which have different themes and messages.
Step-by-step explanation:
The song uses bragging with references to cop killing, drug dealing, and other forms of street violence is b) "Straight Outta Compton" by N.W.A. This song is notorious for its raw and explicit lyrics which reflect the harsh realities of life in Compton, Los Angeles during the late 1980s.
Unlike "Fight The Power" by Public Enemy which focuses on political protest and a call to action against societal injustices, "Rapper's Delight" by The Sugarhill Gang which is known for its catchy and relatively light-hearted party lyrics, and "Regulate" by Warren G and Nate Dogg which tells a story of street justice, N.W.A's "Straight Outta Compton" explicitly details acts such as cop killing. Therefore, the correct answer is b) "Straight Outta Compton".