Pls help What led to higher casualty numbers and a prolonged war during WWI?

Question 30 options:

Pollution

Higher global population

Reducing the amount on money spent on weapons

New weapons and technology

answer: what events

explanation:

you dont have any choices

the alfred thayer mahan award for literary achievement is awarded each year by the navy league of the united states. the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation. presented since 1957, "this award for literary achievement is awarded to a u.s. navy officer, u.s. marine corps officer, enlisted service member, or civilian who has made a notable literary contribution that has advanced the knowledge of the importance of sea power in the united states."[1]

the answer should be founding brothers. i hope i you!