Answer:
The correct answer is option a.
Step-by-step explanation:
An increase in the demand for dollars will shift the demand curve to the right, in the market for foreign exchange. Dollars are demanded by foreign consumers to pay for the import or purchase of US products.
An increase in the demand for goods and services by the foreign producers will increase the demand for US dollars as well.
This will cause the demand for dollars curve to shift to the right. This rightward shift in the curve will increase the value of US dollars in the foreign exchange market.