What is meant by the marginal tax rate?

Select one:

a. It is calculated by dividing the taxpayers total tax payable by their taxable income.

b. It is calculated by dividing the taxpayers total tax payable by the taxpayers total economic income.

c. It is calculated by dividing the rate of GST by the income tax rate.

d. It is the rate of tax that is applied to a particular range of income.