Answer:
c. departs from ability-to-pay principle of taxation.
Step-by-step explanation:
The flat tax rate requires every person to pay the same percentage of their incomes as a tax component. Basically there is no distinction in earning $1,000 or $10,000.
This means the principle of taxation that is the rich class shall pay in order to provide basic facilities to the poor will not meet, if rich and poor are charged the same.
Accordingly this tax system departs from the basic principle of taxation.