A some of the historic events that took place in late 19thcentury and after World War II became key factors in the development of tourism.
B the industry of tourism was already fully developed in late 19thcentury Britain.
C the history of tourism shows that governments and tourist authorities were very aware of all its economic potential well before World War II.
D travel has always been synonymous with what we nowadays call tourism.
E ancient Romans could only afford to visit nearby seaside resorts.