Answer :
Answer: the U.S. real interest rate and net exports will both rise.
Explanation: Due to the ongoing war abroad, there would be a reduction in production of goods and services in the affected countries and a rise in the production of goods and services in the safe haven country (US) leading to increased levels of export to meet the demand.
War affects investments negatively. As a result, investments are also moved to the US for safety. However, pressure on US producers and eventual shortage due to increased exports, would lead to inflation and increase in prices of goods and services. To mitigate these effects and to reduce the supply of money, government would increase interest rates.
This explains why both interest rates and export both rise.