Which is the best reason for John to bring snacks to his study sessions? to make his study sessions enjoyable
to avoid leaving to get food
to avoid taking breaks
to ensure he has enough caffeine

I believe the first answer is the right choice because this way he seems to concentrate more and will have to take breaks. But it will be important for him to take breaks from time to time as well.

Explanation:

your answer is b hope that

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker