The right answer is A. Self-Awareness.
Vital steps for achieving self-awareness is having a healthy self-esteem, learning to like yourself and wanting to improve what you don't like about yourself; A self-concept is the fact that you can define who you are.
Self-awareness is an important factor in life because when knowing your feelings, taste, motivations, and desires, you are able to know who you really are and develop an opinion about yourself. The self-awareness is the understanding of your emotions, where they come from, and how to manage the ones that can possibly harm you.
