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 Navajo language was not widely known. With few people understanding it, it made the code based on it hard for enemies to break. This was a key advantage in military use as it ensured communication security. Options B is incorrect as it's not about ease of learning for Americans (the focus is on code - breaking difficulty). Option C is wrong because other American Indians didn't understand Navajo. Option D is incorrect as it wasn't widely known.

Answer:

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