The correct answer is D.
More than 12,000 American Indians served in the First World War, generally as scouts, snipers and <em>code - breakers (code - talkers).</em>
One of the biggest problems for the Allies was the Germans' ability to listen in on their communication and to break their codes. The codes were usually based on a European language or a mathematician progression.
As it happened, a company commander overheard two Native American soldiers from the Choctaw tribe speak to each other in their language. He recognized the military potential of the language which was of course totally unknown to the Germans.
Using at least six native languages, <em>the Native Americans translated the</em> <em>Allied officers' commands into their native languages</em> so that the eavesdropping Germans wouldn't understand them.
The Allied credited the Native Americans with bringing about an earlier end to the war and saving thousands of lives.
The biggest irony of all this is the fact that the Native Americans were forced to stop using their native languages before by the U.S. government, in order to assimilate them into the American culture.