Correct answer: B). Openness
It is the sixth stage of Erik Erikson's theory of psychosocial development. It takes place in adult between the age of 19 to 40 years. During this period of life, most of the conflict centers on forming, loving relationship, intimate with other people. Success results in fulfilling relationship and failure result in isolation and feeling of loneliness.
So, in order to deal with such problem the adult must maintain close and intimate relationship with other people in order to avoid loneliness.
Hence, the answer would be openness.
