I believe the answer is: retirement savings
Income deduction refers to the amount of money that taken from your income to be allocated into other payments. The amount that being taken should be transparent, being done on timely basis, and intentional.
Example of income deduction include things such as: retirement savings, income tax, medicare, etc.
Retirement savings is a good example of an income deduction.
This refers to financial strategies of saving, investments, and ultimately distributing money meant to sustain oneself during retirement.
It is usually deducted from the income of an individual over a period of time to cater for the person when he/she retires which is why option D was chosen.
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