Answer:
E. World War II
Explanation:
World War II -
The World war II started in 1939 and ended in 1945 .
The war involved more than 30 countries , where 100 million people were involved in the war .
It was the most dreadful war , killing about 85 million people .
The use of weapons was very dominantly seen in this war , management science was first used .
Hence , from the given information of the question ,
The correct option is E. World War II .