Suppose that in 2016 the federal government spent $680 billion and collected $480 billion in taxes. In 2017, government spending fell to $640 billion and government revenue increased to $540 billion. If the government debt was $15 trillion at the beginning of 2016, what will it be at the end of 2017? Select one: a. $15.5 trillion O b. $15.3 trillion O c. $15 trillion O d. $14.9 trillion e. $14.7 trillion Clear my choice