What is a voice-over in screen writing?

a. when the camera focuses on the character who speaks the most
b. when the characters' voices are louder than the background sounds
c. when two characters are speaking at once in a single shot
d. when a character's words are spoken over a scene or series of images

Why did orson welles change the beginning of the war of the worlds for his radio broadcast? a. to capture the attention of his listeners, who may have been doing other things b. to get around copyright laws associated with using material from a published book c. to ask members of the audience to call family and friends and encourage them to listen d. to remind listeners to call police for more information