Notice that the text states that ""Many countries that adopted command economies suffered."" What details from the text support this statement?

The correct answer to this open question is the following.

Although there is no text attached to the question, we can assume the topic is when the Soviet Union exerted ist influence and control over the Eastern European territories after World War II. We are talking about countries such as Poland, Bulgaria, Albany, Rumania, East Germany, and Hungary. Those countries adopted command economies and suffered. In a command economy, it is the state that controls the economic system of the country. In total opposition to the free market economy, in a command economy, the state decides what to produce, when to produce, how much, and at what price.

c or d both can be the answer

the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.