Suppose the world economy is divided into two halves. In Region A, all economies experience a decrease in desired saving, while desired saving is unchanged in Region B

If there is open trade and perfect capital mobility across the two regions, which of the following is true? A) Actual saving in Region B has increased.
B) Actual investment in Region A has increased.
C) Region A's imports from Region B have decreased.
D) all of the above
E) none of the above

A