Read the paragraph from the section “Language Lessons.” The United States used the uniqueness of the Navajo language to its advantage in World War II. Rather than encrypting radio messages, it proved simpler to use Navajos to speak to each other in their everyday language to convey high-security messages. It worked.
Which sentence from the article is BEST supported by the paragraph?
(A) They had diverse cultures and languages, much like Europe.
(B) The Navajo people of the Southwest and the Cherokees of the Southeast have totally unrelated languages.
(C) The tribal differences that caused the Apache and Navajo peoples to fight each other are not so different from the reasons European countries went to war hundreds of years later.
(D) Recognizing tribal diversity is an important step in understanding the history of America.