Read the article and select the best answer. Article: While on vacation in distant locales, people often find that time moves quite differently than in the places they're used to. Robert Levine and his colleagues have studied the speed of life in cities around the world and across the U.S. In a series of experiments they measured how fast a single pedestrian in a downtown center covered a distance of 60 feet, timed how long it took to complete a simple commercial transaction, and recorded the accuracy of randomly selected clocks in the downtown business area. They found that places with a faster pace of life also had stronger economies, and that people in larger cities tended to move faster than those in less populated areas. So as you might expect, fast-moving people are associated with fast-moving economies. But does that faster life translate into greater happiness? In faster places, people were more likely to smoke, less likely to take the time to help strangers in need, and more likely to die from heart diseases. Yet Levine and his colleagues found that people in faster places tended to report feeling somewhat happier with their lives than those who lived in slower places. A city's pace of life was indeed "significantly related" to the physical, social, and psychological well-being of its inhabitants. However, the relationship between income and reported happiness is far from obvious. According to the "Easterlin paradox(,)" (named after economist Richard Easterlin), once people have enough money to meet their basic needs, having more money is not necessarily correlated with higher self-reported happiness. Easterlin's claims are controversial and not universally accepted; even if his theory is correct, wealthier nations might be happier overall if they address the basic needs to more of their people. In any case, the ongoing debate indicates that we need to be careful when making connections between happiness and overall economic factors. Among individuals in a society, busyness -- or the feeling of busyness -- seems to be an important factor in... Question: What can we learn about Levine's study? Options: A: It calculated a person's walking distance during a certain period. B: It was carried out for some commercial purposes. C: It researched life rhythm in various economies and areas. D: It was mainly conducted in the western world.
The answer to this question is:
C