Answer:
D. all of the above
Explanation:
All of the elections listed have a direct effect on the structure of government, and if citizens do not vote, then the election is not truly representative of public opinion.
It was primarily "two world wars" that happened in the world between 1900 and 1950, since the First World War took place from 1914-1918, and the Second World War took place from 1939-1945.
I'm pretty sure It would be Heros, Or Heroines