6. Which condition was a result of Joseph Stalin's
command economy?
(1) Peasants were encouraged to sell surplus
grain for personal profit.
(2) The production of consumer goods
increased.
(3) National revenue increased allowing for
greater individual spending.
(4) The government controlled agriculture
through collective farms.

4th option, "the government controlled agriculture through collective farms"

Explanation:

A command economy is defined as "an economy in which production, investment, prices, and incomes are determined centrally by a government." therefore we know that option four is the correct answer because that describes exactly what happens in a command economy. The government controls every aspect of the economy including things such as agriculture, in this case.