Answer:it might be either c or a not sure tho
Explanation:
Option 4: Sales Tax
A sales tax is a form of a flat tax, it levies the same income rate on all taxpayers.
The answer to the question above is letter D. The economic system combines traditional and free markets with the limits of government involvement. Mixed economy is a system that features a characteristics of both a capitalism and socialism. This allows a level of private economic freedom in the use of its capital.
Answer is D. Explanation because it is