This was known as the war guilt clause, part of article 231 of the Treaty of Versailles
It means "We'll raise a generation, selflessly loyal to communism."
The best and most correct answer among the choices provided by the question is the first choice "British defeat in the Battle of Long Island and Fort Lee"
The Battle of Long Island, also known as the Battle of Brooklyn or the Battle of Brooklyn Heights, fought on August 27, 1776, was a defeat for the Continental Army under General George Washington<span> and the beginning of a successful campaign that gave the British control of the strategically important city of New York.</span>
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<span>The answer is mobility.
Trench warfare was popular at the end of the 19th and beginning of the 20th century, Trenches, essentially large ditches men dug, and then took up defensive positions in, were very good at giving soldiers a place to hide from incoming automatic weapons fire and mortar strikes.
This however gave birth to "trench warfare", a style of combat relying on melee combat, short range weapons like shotguns, and worst of all, penetrating attacks the trenches couldn't protect from, such as shrapnel heavy grenades, flamethrowers, or even chemical weapon attacks.
Trench warfare was also terrible as the living conditions in the trenches often involved standing water, disease, and malnutrition.</span>