Question

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.

Explanation:

The advantage of using Navajo as a military code language is that it was a language known only to a few. This made it difficult for enemies to break the code. The other options are incorrect. Navajo is not a simple language that Americans could learn easily. Just because the Navajo spoke it doesn't mean other American Indians would understand it. And it was not widely known.

Answer:

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