The correct answer is A. Rent + Wages + Interest + Profit.
The income method is a way of measuring GDP by adding up all the incomes earned in the economy in a given year. This includes wages, salaries, profits, rents, and interest.
Option B is the market value of the goods produced in a country in a given year. This is not the same as the income method, because it does not include the income earned by people who are not directly involved in producing goods, such as landlords and investors.
Option C is the sum of consumption and savings. This is not the same as the income method, because it does not include the income earned by people who are not consuming or saving, such as people who are investing their money.
Option D is none of the above.