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.

Answer 1

Since few people understood it, it was a difficult code to break. Navajo was a largely unwritten, complex language spoken by few outsiders, making enemy decoding extremely difficult.