The correct answer is C) mortgage interest payments.
The investment option that is eligible for tax deductions for calculating the net taxable income is mortgage interest payments.
The taxable income is used to calculate how much tax you need to pay regarding your income in a year. You need to pay your taxes for wage, investments, and salaries.
The government of the United States through the IRS office allow citizens to claim an itemized deduction such as interest paid on mortgages. This mortgage is the loan that helps people to buy a house. By its nature and purpose is a long-term loan. So the investment option that is eligible for tax deductions for calculating the net taxable income is mortgage interest payments.