A Good Musical Soundtrack Includes Increasing a Player's Sense of Immersion

Multiple Choice

A good musical soundtrack includes increasing a player's sense of immersion in a game. This could be done by?

A) Using a catchy title theme
B) Defining the surroundings
C) Including specific musical passages associated with a character that can subconsciously clue a player into what is happening in a game.
D) Providing an emotional underpinning to the whole experience