In a progressive tax structure:
a. both the tax rate and absolute tax amount decline with an increase in income.
b. the tax rate increases, but the absolute tax amount decreases with an increase in income.
c. the tax rate falls,but the absolute tax amount increases with an increase in income.
d. the tax rate remains constant, but the absolute tax amount increases with an increase in income.
e. both the tax rate and absolute tax amount increase with an increase in income.