Which of the following has the highest level of integration?

Question

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Political union is the highest level of integration, as it involves not only economic cooperation but also political integration, such as a common currency, a common foreign and defense policy, and a centralized system of government. Economic union (A) involves a common market with a common currency, but not necessarily a centralized government. A customs union (B) eliminates tariffs among member countries, but each member retains its own trade policy with non-member countries. A common market (C) goes beyond a customs union by allowing for free movement of goods, services, capital, and labor, but it does not necessarily involve political integration.

Which of the Following Has the Highest Level of Integration