German defenses at the Battle of the Argonne Forest crumbed under the assault of . one million American soldiers

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a combined force of American, French, and British forces totalling one million troops

one million American soldiers, along with French and British forces

The correct answer is A)  one million American soldiers.

German defenses at the Battle of the Argonne Forest crumbled under the assault of one million American soldiers.

In September 1918, more than one million American soldiers advanced on heavily fortified German positions near the Argonne Forest.

During World War 1, the Battle of Argonne Forest was part of what was known as the Meuse-Argonne Offense, which started on September 26, 1918, and ended two months later, on November 11th. This represented the last armed confrontation of World War 1. The offensive that started on North Verdun, had approximately one million soldiers led by General Pershing.

your answer will most likely be a.