A is the answer I believe
Kings and queens are also known as monarchs.
Christians and muslims fought against each other in the crusades.
A region can be studied over many different periods, but a theme applies to only one period is one major difference between a region and a theme when studying history.
<h3>What is
region in history?</h3>
Regional history is historiography devoted to a physically confined area below the level of the Empire or the nation state, particularly in Germany; the area can be determined by the governance of a territory, as well as cultural, dialectal, economic, and other elements.
Thus, option D is correct.
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