Why were other native languages considered for code talking in World War II?

The choice highlighting that other native languages were considered for code talking in World War II because they were complex and lesser-known is correct. The complexity of these languages made them suitable for creating unbreakable codes. The idea was that a language that was not widely spoken or understood would be less likely to be deciphered by enemy forces, providing a secure means of communication on the battlefield.

Many Native American languages, much like Navajo, possess intricate grammar and vocabulary, which can convey detailed information efficiently. Additionally, the limited exposure to these languages within the military and among the enemy contributed to their effectiveness as a coding system. This ensured that messages could be relayed in a way that would remain comprehensible only to those who were trained in that specific language, maintaining the confidentiality of military strategies and operations.