A particular economy has consumption of$400 million, a government deficit of $100 million, taxes of $250 million, and income of $800 million. Which of the following statements must be true?
A. if investment is zero, there is no foreign trade imbalance
B. If the trade surplus is $50 million, investment will be equal to $100 million
C. if the capital account surplus is $50 million, investment will be equal to $100 million
D. if the trade surplus is $100 million, there will be investment
E. none of the above statements is necessarily true