What is the answer to this question?

In the United States, government expenditure on goods and services as a share of GDP declined between the mid-1960s and late-1990s while the budget deficit was growing.

This income implies that ________.

a. taxes must have declined while government transfers remained unchanged

b. taxes and government transfers must have both declined

c. the trade and current account balances must have declined

d. taxes net of government transfers must have declined

Thank you.