Question

why was the navajo language excellent as a secret code?○ the language relied on numbers rather than letters○ it is not a written language and is understood by very few people○ many of the navajo people of japan had immigrated to the united states○ it was very close to the german language

Explanation:

The Navajo Code Talkers used their language in WWII because it was an unwritten language with extremely few non-Navajo speakers, making it nearly impossible for enemy forces to decode. The other options are incorrect: Navajo uses a writing system now and was not number-based; Navajo are Indigenous to the US, not Japan; and it has no connection to German.

Answer:

it is not a written language and is understood by very few people