The teenage years are also called adolescence. During this time, teens will see the greatest amount of growth in height and weight. Adolescence is a time for growth spurts and puberty changes. A teenager may grow several inches in several months followed by a period of very slow growth. Then they may have another growth spurt. Changes with puberty may happen slowly. Or several changes may occur at the same time.
I think it's the femur, but in the choices the best one might be the Pelvic Bone.
Having a journal can help someone become more fit because, a journal can assist someone to keep a steady routine.
The answer should be B. SC