Respuesta :
the answer is D. because the rearmament of Austria Hungary and Serbia happened in the summer of 1914.
Answer:
- rearmament of Austria Hungary and Serbia
Explanation:
The answer is rearmament of Austria Hungary and Serbia because the rearmament happened even before World War 2.
These were the actual causes:
- policy of appeasement by Britain and France
- armed invasion by northern China by Japan
- military aggression by Germany and Italy
Hope this helps!