Scientists recently documented that influenza spreads around the world

Official solution :

58. (B). You are presented with a paragraph of premises and asked to resolve the problem they present: how to
minimize the spread of flu via air travel. The correct answer will need to rely specifically on the premises and will not
require you to make any inferences or assumptions.
(A) The passage states that the infection can be spread by coughing. The flu virus, therefore, can reach the other
passengers in the “closely-packed environment” before it enters any filters that might kill the virus.
(B) CORRECT. Vaccines provide significant protection against developing the virus (not 100% protection, but you
are asked to “minimize” the impact of air travel, not eliminate it entirely). If all passengers are vaccinated against the
virus, many of those who otherwise would have developed the disease will not, and, therefore, won’t spread it to
others.
(C) Anyone can contract the virus and subsequently spread it; the mentioned populations are merely “especially
vulnerable” to it. Infected people traveling to another place can infect children, senior citizens, and others who have
stayed in their home regions.
(D) The passage states that the infection can be spread by coughing; while it may be true that the virus can also spread
via hand contact, this information is not stated in the passage.
(E) The passage states that people who develop symptoms before travel begins likely would not make the trip; weeding
out those with observable symptoms, then, won’t “minimize” the role of air travel because there aren’t that many
people in this category. The larger danger is those who may be infected but have not yet developed symptoms.