Ellie's self-esteem began to waiver significantly around her 12th birthday. her father, a developmentalist, is most likely to say this to her what?

You will soon be through this and will feel like yourself again.

You're experiencing a temporary awkward stage of development.

Your sense of self has come unbalanced due to all the physical changes you are experiencing.

Explanation: all of the above answers are correct from a developmentalist view.

Developmental psychology scientifically studies all changes that occurs with age throughout the human life. It is a part of Psychology which deals with the process of growing and changing. It focuses on biological, psychological and social factors that play role in age related changes so Ellie's father has studied the human development in all these angles he understand better what changes she is going though as he is initially getting into adolescent stage , he studied all that happen at that stage and how long it last and why it happens.