Concept:National income accounting helps in evaluating the overall economic performance by measuring the output of different sectors.
Explanation:National income measures the total value of goods and services produced in a country within a period.
It is calculated mainly to show how key sectors such as agriculture, industry, and services are performing.
This sectoral performance indicates which parts of the economy are growing and which are declining.
Government and policymakers use this information to assess economic strength and plan for future improvement.
The main purpose is not to decide how income should be shared, help firms raise funds, or determine aid from other countries.
Answer:D. determine the level of sectoral performance