Saurabh: Airlines have made it possible for anyone to travel around the world in much less time than was formerly possible.
Monica: That is not true. Many flights are too expensive for all but the rich.
Monica’s response shows that she interprets Saurabh’s statement to imply that
Saurabh – anyone can travel around the world, because of airlines.
Monica – many flights are too expensive.
Conclusion – anyone can travel long distances by air. Option D is the right answer.
Option C is ruled out because it is talking about world travel, not air travel.