Why does Jamie choose the bed farthest from Margaret?

Jamie’s new friends do not like Margaret.

Jamie feels uncomfortable near Margaret.

Jamie does not like Margaret because she is older.

Margaret has told Jamie to stay away from her

Read the excerpt from "I'm Not Thirteen Yet" by Amy Bernstein.
As the first day turned into the third, I still missed home. I made friends, but not with Margaret. I chose the bed farthest from where she slept. I figured I could avoid her for two weeks, no problem.