Concept:A fall in national output reduces the goods and services available, which affects consumption and the level of savings in the economy.
Explanation:National output is the total value of final goods and services produced in an economy.
When national output falls, the quantity of goods and services available for people to buy becomes smaller.
Because fewer products are available, people are unable to spend as much as before on consumption.
As a result, consumption expenditure falls.
The part of income that is not consumed becomes savings.
When there is less to buy, consumers are forced to save the income they cannot spend.
Thus, a fall in national output necessitates a higher level of savings.
Answer:B. a rise in the level of savings