Lenin responded to a crisis in soviet agriculture in 1921 by:
a. allowing peasant farmers to own land and seek their crops
b. collectivizing agriculture
c. selling russia's art treasures to raise cash
d. sending troops to the fields to confiscate crops

The good answer is:

a. allowing peasant farmers to own land and seek their crops

Explanation:

The dire situation of Soviet economy and the mutiny of the Kronstadt sailors made Bolshevik Leader Vladimir Lenin revise the war communism policies in 1921. The New Economic Policy was designed and applied. In agriculture, peasants were allowed to keep a part of their produce to sell for profit, which allowed some relief. The NEP stopped grain requisitioning and introduced some elements of capitalism.

he sent troops to protect the students as they entered the school.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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