As the Article Details, Massively Multiplayer Online Role Playing Games

As the article details, massively multiplayer online role playing games (MMOs) such as World of Warcraft (WoW) , Lineage II, and Everquest are immensely profitable, skillfully designed, immersive, and beautifully detailed virtual worlds that enable both exciting gameplay and ______.

A) the creation of real-time digitally embodied communities
B) cool characters that you can relate to in the real world
C) the creation of complex social experiments that can influence how people think about games
D) complex economies that can teach players about real-world finances