Final answer:
In the section "Painful History," readers can find information about why Nez and Begay had been punished for speaking Diné.
Step-by-step explanation:
The information about why Nez and Begay had been punished for speaking Diné can be found in the section "Painful History." This section of the text provides details about the history of the Navajo language and how it was suppressed during World War II. The punishment for speaking Diné was a result of efforts to assimilate Native American children into mainstream American culture.
Learn more about Navajo language suppression during World War II