The Hilton Hotel Chain Serves Both Business and Vacation Travelers $D _ { \text {Business } }$

The Hilton Hotel chain serves both business and vacation travelers.Above, $D _ { \text {Business } }$ and $M R _ { \text {Business } }$ represent the demand and marginal revenue for business travelers,while $D _ { \text {vacation } }$ and $M P _ { \text {Vacation} }$ are the demand and marginal revenue for vacation travelers.What price should the Hilton charge VACATION travelers?

A) $20
B) $30
C) $50
D) $60
E) $70