Which of the following items is not included in measuring national income by the income approach?

Student's grants and scholarships are not included in measuring national income by the income approach. This is because grants and scholarships are considered transfer payments and not payments for productive activities. Transfer payments are payments made by the government to individuals without any goods or services being exchanged in return. National income is the total income earned by a country's citizens, including wages, profits, rents, and interest, from their participation in productive activities. Therefore, student grants and scholarships, which are not payments for productive activities, are not included in the calculation of national income by the income approach.