The correct answer is A) Because the swine flu left no region untouched, travel slowed as people feared exposure to the disease.
Although there is no image attached, we can say that the effect the swine flu most likely had on travel during its outbreak was "Because the swine flu left no region untouched, travel slowed as people feared exposure to the disease.
During the swine flu pandemic of 2012, the federal government made many recommendations so people could prevent the spread of the disease. The travel industry was one of the affected ones because people limited traveling to just necessary trips, affecting the hospitality business for a while.
Nothing compared to the present situation of Cronavirus, which has completely shut not only the traveling industry but mostly all kinds of business in many countries of the world. Just basic business regarding health services, maintenance services, or security, are the kind of business that still operates.