The correct answer to this open question is the following.
You did not include the options for this question. However, we can say the following.
Members benefit by practicing new interpersonal skills, by getting and discussing abilities, and by modifying certain behaviors so that they are more likely to bring about desired changes once they leave the group.
That is why it is important to be open and share with the group your skills and abilities, so there could be some feedback that helps you improve any behavior. Other people can do the same to you in order to receive feedback, and complement each other.