Final answer:
The decrease in an economy's exports will decrease domestic aggregate expenditures and the equilibrium level of GDP. Therefore, the correct option is B.
Step-by-step explanation:
The correct answer is b. decrease domestic aggregate expenditures and the equilibrium level of gdp.
When an economy's exports decrease, it means that there is a reduction in the amount of goods and services being sold to other countries. This decrease in exports leads to a decrease in domestic aggregate expenditures, as there is less demand for goods and services from foreign buyers. As a result, the equilibrium level of GDP, which represents the total value of goods and services produced in the economy, will also decrease.