Which factor played the GREATEST role in making World War I one of the deadliest conflicts in human history?

A) The use of atomic weapons in the Pacific and the genocide of the Holocaust in Europe.
B) New military technology like airplanes, machine guns, tanks, and poisonous gas made combat deadlier than ever before.
C) Improved transportation and shipping methods made getting troops and supplies from one place another easier than ever before.
D) Improved medical technology and methods reduced the effect of disease and improved survival rates for soldiers wounded in combat.

Your answer would most likely be B

Explanation:

New military technology allowed for even deadlier attacks, resulting in more casualties world wide. With the demand for machine guns on the rise, aircraft could perform the work of a tank from miles away. In conclusion B is your answer...also took the USA Test Prep : )

i do not know if this question has options, but a main impact of the federal reserve act of 1913, which created the federal reserve bank, was the international use of the u.s. dollar, which soon became the world's leading currency - particularly during world war i, since many nations around the world asked the united states for money.