Correct Answer: All of the above

Solution : The correct answer is d) All of the above.

All the options are included in the calculation of national income. National income is a measure of the total income earned by individuals, businesses, and other entities within a country during a specific time period. It includes various components of income, and rental income, dividend income, and interest income are among them.

Rental income refers to the income earned from the rental of property or assets. It is considered a component of national income.

Dividend income represents the income received by individuals from their ownership of shares in companies. It is also included in the calculation of national income.

Interest income is the income earned from lending money or from investments in interest-bearing assets such as bonds or savings accounts. It is considered a component of national income.

Therefore, all the options are included in the calculation of national income.