The inference can be made when the last sentence in the text is compared and contrasted with the rest of the passage is:
California has opened its doors to Europeans since 1907. (Option D)
What is an Inference?
An inference is a kind of logical or mental deduction or conclusion that is arrived at based on evidence from the text or story.
When a person arrives at a conclusion by adding one or two logical facts together, they are said to have made an inference.
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