Answer:
The correct answer is option a.
Explanation:
An increase in the demand for US bonds will shift its demand curve to the right. This rightwards shifts in the demand curve for US bonds will increase their price. Â
The higher price of bonds indicates a lower interest rate. At lower interest rate investment in the US will become less profitable. So the domestic investors will invest their money in the countries with higher interest. Â
This will increase the supply of US dollars in foreign exchange. This increase in the supply of US dollars will shift the supply curve to the right.