Economies.
Most modern nations have
A traditional
B. purely free-market
C. government-planned
D. mixed
Please select the best answer from the choices provided.

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D. mixed

Explanation:

The predominant economic type today in modern nations is the mixed type of economic.

In a mixed economy, both private and government tools are used to impart the economic variables of a nation.

The government makes economic decisions like regulations, tariffs, duties and taxes where as the private enterprises are saddled with the production means.

Both the government and the enterprises are responsible for the economic controls.

For example, the United State operates a purely- free economy but it is regulated by controls through the government.  

doctrine that the us had the right to expand throughout north america.