Which of the Following Statements Regarding Background Music in a Restaurant

Which of the following statements regarding background music in a restaurant were found to be true?

A) Consumers spend more money when fast music is played.
B) Customers are served faster when slow music is played.
C) Customers run higher bar bills when slow music is played.
D) Gross margins are higher when fast music is played.
E) Customers are willing to wait longer for a table when fast music is played.