Explanation:

Price Mechanism and regulated Price (Correct - A mixed economy allows both the market-driven price mechanism and, in certain cases, regulated prices to achieve economic objectives.)

Private Property is allowed (Correct - In a mixed economy, private property is typically allowed, allowing individuals to own and control property and resources.)

Profit Motive (Correct - In a mixed economy, the profit motive is a driving force, encouraging entrepreneurship and economic growth.)

Check on Economic Inequalities (Correct - A mixed economy often seeks to address economic inequalities through a combination of market forces and government interventions.)

So, the correct combination is "1, 2, 3, and 4," which corresponds to option 4.