I'm pretty sure A is the secondary source. All of the others come directly from the source/person, but an interview is getting someone else's view.
<span>south american country is home to most of the continents rainforests is </span>Brazil
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. When Russia began to mobilize due to its alliance with Serbia, Germany declared war on Russia.