By replacing the year with the Page number. The author should already know background information from either the title or the intro paragraph. Good luck!
B. Marie Curie....
because it is simply stated fact and not something that could have been exaggerated or made up, like the other 3 answers.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
<span>A vassal owed his first loyalty to his liege lord. </span>
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