Directions: Read the passage/argument and answer the question that follows it.
Very few inputs influence the US economic system as much as oil prices. Oil runs the cars, trucks and planes that transport people and products. As oil prices rise, costs rise for transportation companies such as airlines and freight delivery companies, squeezing their profit margins. Downstream of these companies, customers who rely on them to get products to markets are similarly impacted by higher prices. Contrarily, most energy companies benefit from higher oil prices, either from higher oil revenues, or due to more demand for alternatives like ethanol and clean energy. Car companies with fuel conservation technology such as hybrid engines can expect more sales as consumers feel the pinch of higher oil prices, while those who rely on sales of Sports Utility Vehicles may feel challenged business-wise.
The author conveys his point primarily by