A Patient Is Holding a Piece of Elastic Tubing with Both

A patient is holding a piece of elastic tubing with both hands in front of the body.Both elbows are flexed to 90 ^$\circ$ ,and both upper arms are held gently against the sides of the patient's chest.Instruct the patient to internally and externally rotate both shoulders simultaneously in this position.This activity strengthens the:

A) Internal rotators concentrically and eccentrically.
B) External rotators concentrically and the internal rotators eccentrically.
C) Internal rotators concentrically and the external rotators eccentrically.
D) External rotators concentrically and eccentrically.