Which of the following would be considered an export for Bulgaria?
A. German investor getting interest payments on bonds issued by a Bulgarian firm
B. Bulgarian citizens traveling to France to watch a series of soccer matches
C. A Bulgarian firm hiring an engineering consultant from Greece to help it improve the efficiency of a chemical process
D. An American student going to study at Sofia University in Bulgaria E. The Bulgarian government purchasing a Chinese supercomputer to help them run large-scale mathematical simulations.