Which is one advantage of using navajo as a military code language?

since few people understood it, it was a difficult code to break.

since it was simple, americans could learn it easily.

since the navajo spoke it, other american indians would understand it.

since it was widely known, allied forces could learn it easily.

Option A is the right answer, that 'since few people understood it, it was a difficult code to break'.

Code Talkers in the 20th century were the people who used the Navajo language as the method of coded communication during wartime. This language Navajo helped U.S Marine Corps to transmit coded messages without any breach with the help of U.S natives, who used their expertise in this language. Because of its pronunciation, Navajo language was difficult to break.

In fact, the U.S Marine Corps concluded that at the beginning of the second World War,  the Navajo language was known to even less "than thirty non-Navajos".

the answer is false.