The correct answer to the question stated above is letter C which is: They sailed up the navigable rivers of Europe and across the Atlantic in longships.
Vikings were Germanic Norse<span> seafarers, </span><span>who </span>raided<span> and </span>traded<span> from their </span>Scandinavian<span> homelands across wide areas of northern and central Europe and European Russia, during the late 8th to late 11th centuries.</span>
The Union of Soviet Socialist Republics later dissolved into fifteen independent countries in 1991.Three of the them, Estonia, Latvia and Lithuania declared their independence even before the demise of USSR in September 1991. The basic on USSR countries are here!
Nationalism led to the assassination of the Archduke of Austria Franz Ferdinand. he was assassinated by Gavrilo Princip, a Serbian Nationalist.
I'm going to say B because blitzkrieg means flash war in German. Rapid, flash, kind of the same idea.