This primary source created by option A. Just after Austria-Hungary declared war on Servia (Serbia).
In regards to history, a primary source is known to be anything that is seen as an artifact, document, diary, manuscript, and others.
It is known to be one that is seen as the main source of information that was said to have been formed at the time the event was said to have occurred.
Note that from the study or ad above the newspapaer was said to have written that article just after Austro-Hungarian Government Has Declared War on Servia.
Therefore, This primary source created by option A. Just after Austria-Hungary declared war on Servia (Serbia).
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