The element that is most likely to be featured in a work of realistic fiction is "well-defined character suggested by actual experience." This would provide the most realistic character.
B.
economic is about the economy.
political is literally what it says.
social is about the society.
i think.
The irony of Gatsby's funeral is that hundreds of people would show up at his parties but no one showed up at his funeral. Even though he had everything and everyone loved him for his possessions, no one cared enough to know him personally. Nick was his only friend that Gatsby actually had.