If the adolescent fails to resolve the identity crisis by the time of entry into adulthood, he will feel a sense of role confusion or identity diffusion. others seem to avoid the crisis altogether and settle easily on an available, socially approved identity. still others resolve their crises by an available but socially disapproved ideology. this latter option is called negative identity formation and is often associated with delinquent behavior. resolution of the adolescent identity crisis has a profound influence on development during later adulthood.

The answer is "adopting".  It is an excerpt from the book of Andrea Sofroniou, "Therapeutic Psychology". It tackles Adolescence, a Psychosocial Stage by Erik Erikson, where an individual (aged 12-19 years), encounters conflict between his identity and feelings of confusion. 

"If the adolescent fails to resolve the identity crisis by the time of entry into adulthood, he will feel a sense of role confusion or identity diffusion. Others seem to avoid the crisis altogether and settle easily on an available, socially approved identity. Still others resolve their crises by adopting an available but socially disapproved ideology. This latter option is called negative identity formation and is often associated with delinquent behavior. Resolution of the adolescent identity crisis has a profound influence on development during later adulthood."