Which statement describes the start of ww1
a: germany invaded the balkans and russia took control of austria, leading to a declaration of war.
b: the assassination of archduke franz ferdinand set off a chain of events among european alliances that led to war.
c: great britain and germany met to divide up the balkans, but could not resolve their differences and went to war.
d: archduke ferdinand ordered an invasion of france, and great britain declared war in france's defense.