Answer: A. Increase / Appreciate / Depreciate
Step-by-step explanation:
If disposable income increases more in South Africa than it does in the U.S., assuming the U.S. is a trading partner to SA, they will export more goods to SA because South Africans will demand more goods and services as they can afford to.
This will lead to a higher demand for the U.S. dollar which is the price that the U.S. goods will be denominated in and a higher demand for the dollar will make it appreciate.
The South Africa rand will depreciate because there is less demand for it relative to the U.S. dollar.