People's fear of flying planes is actually unjustified. According to statistics, in 1995, the number of deaths caused by ground traffic accidents in the world exceeded 800,000, and in the 10 years from 1990 to 1999, the world died of air crashes every year There are less than 500 people, and in these 10 years, less than 25 people have suffered an average annual air crash in China. In order to evaluate the validity of the above argument, which of the following questions is most important? ['During the above 10 years, how many people use ground transportation and how many people use the shipping.', 'In the above 10 years, how many people use ground transportation and how many people use shipping on average every year in China.', 'In the above 10 years, how many people in our country die each year from ground traffic accidents.', 'During the above 10 years, was the highest number of deaths caused by ground traffic accidents worldwide in 1995.']