The statement “But changes came in the family . . . ” serves which of the following purposes? A.
to describe the erratic life of young teenagers
B.
to emphasize the speaker’s family connections
C.
to hide the anger the speaker feels toward the situation
D.
to indicate a shift in tone
E.
to contrast childhood with adulthood

I believe the answer is E because later on in the sentence she states that she is going to school in Jacksonville. " But changes came in the family when I was thirteen, and I was sent to school in Jacksonville"

It doesn't sound like she has any anger in the sentence, she's not stating any family connections, nor is it about her life a young person. The only other option I see being right is D. As it is changing the tone of the next paragraph

the long and short of it is its probably E

I'm still taking the test so I don't know how right this is.

not concrete, existing in thought or as an idea but not having a physical or concrete existence