The difference in how history is written (and rewritten) today, in the 21st century is Historians use modern science and technology to investigate and imagine historical events. Thus option C is correct.
History is referred to as events that take place in the past and the study of history helps to know the occurrence and significance of events that took place in the past.
Modern science and technology are used by historians to examine and think up historical facts whereas Today's historians use a number of the same techniques that researchers do to examine history.
Therefore, option C is appropriate.
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