Where is Mrs. Smith most probably

A．To show the inability of trains to compete with planes with respect to speed and convenience.
B．To stress the influence of the automobile on America's standard of convenience.
C．To emphasize the function of travel agencies in market promotion.
D．To illustrate the important role of persuasive communication in changing consumer attitudes.

A．the attractiveness of its name and route was effectively advertised
B．it provided an exciting travel experience
C．its passengers could enjoy the great western outdoors
D．it was widely advertised in newspapers and magazines in Chicago and Seattle