It is True to infer that the most difficult part was getting parents to release their kids to Irena. This is because they had no way of knowing whether or not to trust her.
When a conclusion is reached or drawn after the rational examination of the facts from a text, the person is said to have made an inference.
Hence the inference or deduction that the most difficult part was getting parents to release their kids to Irena during the rescue operation is TRUE.
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