According to the Ricardo-Barro effect, government deficits________.
选项：

A:lead to a rise in the equilibrium real interest rate, crowding out investment.
B: lead to simultaneous increases in private saving and no effect on the equilibrium real interest rate and investment.
C: lead to simultaneous decreases in private saving and decreases in the equilibrium real interest rate and investment.
D: lead to a fall in the equilibrium real interest rate and a rise in investment.