Test25, RC, #21

[candy1234]

The Answer is C but I cant find where the answer lies in the passage..
Can someone explain where I can find the phrase "intertribalism helps strengthen native American identity?"

Thanks!

[510Chicken]

In the last sentence: "Intertribal activities, on the other hand, reinforce native American identity along a broader front, where this identity is directly threatened by outside influences".