In Fifth Grade Last Year, Elena Was a Happy, Easygoing

In fifth grade last year, Elena was a happy, easygoing student. Now that she's moved to junior high school and begun sixth grade, she's becoming increasingly anxious and uptight. Three of the following are probable reasons for her growing anxiety. Which one is least likely to be true?

A) It's harder to get the good grades she was used to getting in elementary school.
B) Her junior high school teachers want to know more about her than her fifth-grade teacher ever did.
C) She's uncomfortable with the many ways that her body is changing now that she's reached puberty.
D) She is finding that she has to compete with her peers, both for grades and for a place on the girls' basketball team.