How did the transition from a command economy to a market economy affect the russians

A command economy occurs when the government control the main means ... Prices and output are determined by market forces. ... an increase in unemployment and a negative multiplier effect; Many industries were so bad ... Problems faced by Russia and other countries making the change .

the answer is option a.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: