In Describing Educational Games, Simulations, and Virtual Worlds, Which of the Following

Multiple Choice

In describing educational games, simulations, and virtual worlds, which of the following statements is true?

A) "They all share some characteristics."
B) "It's difficult to find a 'pure' experience in any of the genres."
C) "Simulations may have game-like qualities, and virtual worlds may be used to present a simulation."
D) All of these are correct.