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 $M R _ { \text {Buiness } }$ 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 is the profit-maximizing number of BUSINESS travelers to serve?

A) 55
B) 100
C) 150
D) 200
E) 300