What key event led to the outbreak of World War I?
A.
the rise of a fascist German chancellor
B.
the assassination of an Austrian archduke
C.
invasion of Vienna by Serbs
D.
the seizure of Romania by Bulgaria
A.
the rise of a fascist German chancellor
B.
the assassination of an Austrian archduke
C.
invasion of Vienna by Serbs
D.
the seizure of Romania by Bulgaria