Answer:
The different sound effects create different moods and can control the emotions of the audience. Music right before the killer is going to strike can create a heartbeat effect, due to the throbbing effect of the music, therefore creating a sense of malice and tension therefore creating suspense.
In several words, listening to any specific genre of music will not affect your intelligence. Sometimes one's intelligence will influence what kind of music they listen to, but that's about where the correlation ends, and it still differs from person to person. Try rap music.
"A" as it's not paying much attention to the infant
Answer:
sit in a quiet place and with no phones
