It is not safe to conclude based on the text that the stranger was part of Rosie's Imagination because there are no facts in the extract to support such inference.
An inference is a conclusion that is drawn from already established facts. Think of it as the process of mining information from existing information.
If the stranger wasn't surprised, it could have been because of other conditions external to him or her.
Learn more about inference at:
https://brainly.com/question/16750080
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