Please help me! The concept seen the pictures above is

a. desertification

b. terrace farming

c. deforestation

d. migration

d) post-world war i

to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.

not sure but thinking i'ts cause the government was broke. not sure

the crusaders are identified in the painting;

c. by the red crosses on their backs