Yet some people wonder if the revolution in travel has gone too far. A price has been paid, they say, for the conquest (征服) of time and distance. Travel_is_something_to_be_
enjoyed,_not_endured(忍受).  The boat offers leisure and time enough to appreciate the ever­changing sights and sounds of a journey. A journey by train also has a special charm about it. Lakes and forests and wild, open plains sweeping past your carriage window create a grand view in which time and distance mean nothing. On board a plane, however, there is just the blank blue of the sky filling the narrow windows of the airplane. The soft lighting, in­flight films and gentle music make up the only world you know, and the hours progress slowly.
How does the writer support the underlined statement in Paragraph 2?

A．By giving instructions.

B．By analyzing cause and effect.

C．By following the order of time.

D．By giving examples.