I need help with this, i already did the crossword i just need the thing below please.

The code talkers work contributed mostly to

Which of these is an edge city? boston, ma chicago, il irvine, ca detroit, mi

Which is one factor that contributed to the rise of sikhism? a. the spread of christianity into india b. opposition to the hindu caste system c. objections to the five pillars of islam d. a return to polytheistic religion