The table lists the annual amount (in billions of dollars) spent by the federal government on health research and training programs over a 10-yr period.

Which one of the following provides the best model for these data, where x represents the year?

A. ƒ(x) = 0.2(x - 2004)² + 27.1 

B. g(x) = (x - 2004) + 27.1

C. h(x) = 2.5√x - 2004 + 27.1 

D. k(x) = 0.1(x - 2004)³ + 27.1

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Amount Amount (billions of $) (billions of $) Year Year 2004 27.1 2009 30.6 2005 2010 28.1 34.2 36.2 2006 28.8 2011 2007 29.3 2012 34.5 2008 29.9 2013 32.9