The bar graph in the following graphic represents fictional net exports in billions of dollars for five countries. Net exports are obtained by subtracting total imports from total exports; a negative net export means the country imported more goods than it exported. Net Exports (Billions of dollars) United States Denmark China Germany Spain -150 -100 -50 0 50 100 150 Net Exports (Billions of dollars) Estimate the net amount of exports for Spain.

a. 10 billion dollars
b. 30 billion dollars
C. -20 billion dollars
d. 20 billion dollars

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