Prices of crude oil have been steadily rising over the last two years (The Wall Street Journal, December 14, 2010) . The monthly data on price per gallon of unleaded regular gasoline in the United States from January 2009 to December 2010 were available. Three trend models were created starting with t = 1, and the following output was generated. 
Based on adjusted R2, which of the following models is the most appropriate for making a forecast for the price of regular unleaded gasoline?
Definitions:
Profit-Maximized
The process or strategy by which a firm adjusts its production and sale operations to achieve the highest possible profit.
Power Cords
Electrical cables that connect an appliance to the main electricity supply, enabling its operation.
Market Wage Rate
The prevailing rate of pay for given work in a specific industry or region, determined by supply and demand for labor.
Profit-Maximizing Quantity
The level of output at which a company can make the highest possible profit, considering its cost structures and market price.
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