If Sam's,a Local Watering Hole,increased the Price of a Pint

If Sam's,a local watering hole,increased the price of a pint of Guinness by 20%,it estimates the number of MBA students purchasing Guinness would decrease by 4%.Based on this data,

A) total revenues would increase because demand is elastic.
B) total revenues would decrease because demand is elastic.
C) total revenues would remain the same.
D) total revenues would increase because demand is inelastic.