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.

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.

c or d both can be the answer