According to the attached image, the primary source was created Just after Austria-Hungary declared war on Servia (Serbia)
In history, a primary source refers to the first account of an event which is narrated by people who were present when such an event occurred.
The primary source of an event is the most direct evidence of a time an event happened and is usually devoid of twists because such events are narrated as truthful as possible.
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The primary source was created after the declaration of war on Serbia by the country of Austria and Hungary.
Option C is the correct answer.
A primary source is referred to as the source which was created in the ancient era by the historians of that time.
The country of Austria and Hungary declared the warfare on Servia in the year 1477 and ended in the year 1488. After this, primary sources like artifacts, diaries, biographies, manuscripts, etc. were created.
Therefore, the explanation given in Option C would be the correct answer.
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