Which of the following statements is true? A. An increase in investment must be reflected in either a decrease in private or public saving or a deterioration of the current account balance. B. A deterioration in the government budget balance must be reflected either in an increase in private saving or an increase in investment. C. A deterioration in the government budget balance must be reflected in a deterioration of the current account balance. D. A country with a high saving rate (private plus public) must have either a low investment rate or a large current account surplus