When the government levies a $100 million tax on people's income and puts the $100 million back into the economy in the form of a spending program such as new interstate highway construction, the Select one: a. tax, then, generates a $100 million decline in national income b. tax multiplier overpowers the income multiplier, triggering a rollback in national income c. effect on national income is uncertain d. level of national income expands by $100 million