You didn't underline anything, so we cannot know for sure what the correct answer is. However, I'll just write down the entire infinitive phrases in these sentences, and you can see the answer based on that:
1. to see a great play
2. to cheer good plays
3. to practice until you know all the plays
All of the above why wouldn’t it be
Answer: Part A: D They separated into different groups long ago.
Part B: The answer is: "it also seems like they didn't mix much with outside groups until the arrival of Europeans in the seventh century"
Explanation: I took the test hope this helps!
