Stephanie Is Describing Her Friend Eleanor: "She's Really Quite Moody

Stephanie is describing her friend Eleanor: "She's really quite moody, but I've learned to tell when she'll be shy and when she'll be outgoing. She's better at settling arguments than nearly anyone else I know, and she always tries very hard to be nice to people." On the basis of this description, how old would you guess that Stephanie is?

A) age 5
B) age 8
C) age 10
D) age 12
E) age 16