The cominform was established by the soviet union to

a.) educate east european nations in communist theory
b.) encourage tourism in the u. s.s. r.
c.) aid communist parties in west european nations
d.) carry on espionage to steal military secrets in the west

The Cominform was established by the Soviet Union to:
C.) AID COMMUNIST PARTIES IN WEST EUROPEAN NATIONS.

Cominform or Communist Information Bureau was established in 1947. Its official name was Information Bureau of the Communist and Worker's Parties. Its purpose was to coordinate actions of communist parties under the Soviet direction. It was dissolved in 1956. 

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