The correct answer is b, identity. It is because as an individual is in the stage of puberty or he or she is already a teenager, he or she is likely to discover things that he or she does not know of as when he or she was a child, and by that, he or she is in search of new things and even what she or he really is and what he or she would want to be as he or she finish this stage as she or he levels to adulthood.