When We Watch a Film in the Theatre, We Perceive

Multiple Choice

 When we watch a film in the theatre, we perceive the sound as coming from the actors' lips instead of from the speakers arrayed around the screen. This is probably due to

A) the superiority of modern surround-sound systems.
B) our use of vision to aid the localization of sound.
C) the construction of the theatre, which is designed to reflect sounds from the back and sides of the building.
D) our inability to localize sounds above a certain amplitude.