I think the answer is A. the person with whom they are most familiar
Senetor Richard Russell was the Senator who urged President Kennedy to act speedily and invade Cuba.
Answer:
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Explanation:
The nationalist movement that had the biggest impact was the outbreak of war by Slavic groups in the Balkans. ... It was this intensified form of nationalism that led to the start of World War I through the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914.The most direct way nationalism caused World War I was through the assassination of Archduke Franz Ferdinand, who was the heir to the throne of the Austro-Hungarian Empire. Many oppressed Slavic groups in the Austro-Hungarian Empire wanted to form independent nation states. ... Soon enough, World War I broke out.
A secondary source is basically an object or writing that is not from that time period, rather using primary sources to write or copy it.
An example might be a textbook on a certain topic that is modern.