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The city of Portmund has a large taxi industry. Generally, the availability of taxis tends to increase at times when the demand for their service is higher. But according to a survey of driver hours and revenues, when demand for taxis is highest, the number of taxis in service tends to be far below its peak. One researcher has suggested that this is in part because many taxi drivers choose not to work when rain or snow makes for hazardous road conditions.

Which of the following, if true, would most contribute to strengthening the researcher's explanation?

For decades, government agencies in Country Y have been trying to reduce the population's consumption of salt. In the 1980s, the government issued consumer guidelines including advice against excess salt and shortly thereafter called on the food industry to voluntarily reduce the relatively high levels of salt in processed foods, which the food industry did to some extent. However, data from a 2008 national study showed that men were, on average, consuming 45 percent more salt than men did in the early 1970s, and women, 69 percent more.

Which of the following would, if true, most help to account for the plan's failure to achieve the desired results?

Verenia is a remote, undeveloped upland area whose streams and rivers are neither dammed nor used for crop irrigation. Measurement of water flow in those streams and rivers shows a substantial increase over the last 50 years, indicating an increase in precipitation. However, even though rivers in the area are extremely prone to flooding, there has been no comparable increase in either the frequency or the severity of flooding there.

Which of the following, if true, most helps to resolve the discrepancy between precipitation and flooding in Verenia?

Coastal Rail provides commuters with an alternative to driving between Seaside County's coastal towns. However, the number of people who ride Coastal Rail trains on Fridays after 4 p.m. is not sufficient to cover the expenses of running those trains. Coastal Rail's management has nonetheless rejected as financially unsound a plan to discontinue Friday evening service.

Which of the following, if true, provides Coastal Rail's management with the best justification for its decision?

Archaeologists found a large forest mound that showed evidence of use by an ancient society about 1,000 years ago, including compacted soil indicating trails or roads, and small copper bells and jewelry in test excavations. Some of the archaeologists concluded that the mound was built and regularly used by members of the society as part of a permanent village, something they were known to have done at nearby sites. Others concluded that the mound was a natural feature visited intermittently for rituals.

Assuming that one of the two conclusions cited above is correct, which of the following, if discovered at the site, would most help determine which is the correct one?