during world war II, american indians

a) demanded that president roosevelt end discrimination in defense industries
b) rarely enlisted in the armed forces
c) moved south to replace african-american laborers
d) moved off reservations in large numbers
e) promoted the recovery of tribal languages

I think its e?

Yes, you're right. SraJMcGin posted a site telling about the Navaho Code Breakers when you asked this question earlier.