How would each of the following affect the U.S. balance of payments account?
a. Every month, a Bangladeshi professor at the University of Utah sends $200 to his family living in Bangladesh.
b. A Japanese businessperson in Nagasaki buys 100 shares of General Motors stock.
c. The U.S. government sells 20 Patriot missiles to the Israeli government.
d. The U.S. government gives the Russian government 50 million tons of wheat, priced at $3 per ton, in the form of a unilateral transfer.