The problem that Castro's victory caused is option(b)i.e, The Soviets were losing control of their satellite states.
Fidel Castro, a politician and communist revolutionary from Cuba, participated in the Cuban Revolution from 1953 to 1959. As a result of his early experiences, Castro made the decision to launch "The Movement," a paramilitary group, in order to fight for the fall of Fulgencio Batista's military government.
As a staunch Marxist-Leninist, Castro was committed to transforming Cuba and the rest of the world from a capitalist economy in which private individuals own the means of production into a socialist one in which the workers own the means of production.
However, the Spanish withdrew from the island in 1898 as a result of the Spanish-American War, and after three and a half years of subsequent US military control, Cuba officially attained independence in 1902.
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