Travel Websites Such as Travelocity Tend to Offer Reservation Services

Multiple Choice

Travel websites such as Travelocity tend to offer reservation services for multiple travel modes.This is because

A) the firms have contractual obligations to offer reservations for airlines and railroads, for example.
B) the firms have statutory obligations to offer reservations for airlines and railroads, for example.
C) once the firm has the reservation technology for airlines, there are economies of scale in offering the same service for railroads.
D) once the firm has the reservation technology for airlines, there are economies of scope in offering the same service for railroads.