The actions by Stalin that affected the relationship between the West and the Soviets was C. Soviet refusal to conduct the elections heightened distrust between the two sides.
In order not to lose control of Poland, Stalin refused to allow free elections in Poland and instead controlled it via Communist proxies.
As a result, the Western nations were annoyed by Stalin breaking an agreement and so distrusted the Soviets more.
In conclusion, option C is correct.
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