The correct connecting word for the sentence is Because as it best explains Emilia's nervousness in relation to marrying a man she had never met. Each of the other options fails to logically connect her feelings to her situation. Thus, using Because best conveys the cause-effect relationship between her marriage and her emotions. ;
The best connecting word for the sentence is because , as it accurately links Emilia's feeling of nervousness to her situation of marrying someone she has never met. Other options either change the meaning or do not connect the two ideas effectively. Therefore, because is the ideal choice for this context.
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