The best and most correct answer among the choices provided by your question is the fourth choice or letter D.
<span>During the late 18th and mid-19th centuries, Europeans and North Americans were attracted to nearby coastal waters due to potential economic gains from finding riches on unexplored islands.</span>
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It was a chain reaction. Long story short, the countries were pulled into the war because of agreements they had with their allies. This treaty is what caused the countries to enter WWI, to protect and defend their allied countries who were already in the war.
They were upset because the law forbade them from settling in the Ohio River Valley where there was fertile soil for farming, and the Native Americans weren't using it, plus many colonists had already bought land west of the Appalachians and now weren't allowed to move. Many colonists did not respect the Native Americans and did not want to preserve their land. The colonists just ignored the law and moved across the Appalachians.
Because most countries involved in the war had alliances with others. And when one was attacked the ally came to protect the other. Therefore countries became more and more involved in the war
