Erikson would have suggested that adolescents can most effectively develop a sense of identity by

 Investigating personal suitability in various roles.

Explanation: One of the fundamental concepts in Erickson's theory is that of crisis or conflict that the individual lives through the periods he goes through, from birth to the end of life. Each conflict has to be resolved positively or negatively by the individual.

Positive resolution it can be a virtue, which is a psychological, emotional and social gain: a quality, a value, a feeling, in short, a personality trait that gives it mental balance and the capacity for a good social relationship.

If the resolution of the crisis is negative, the individual will feel socially maladjusted and will tend to develop feelings of anxiety and failure. However, at a later stage, the person can go through experiences that restore his balance and compensate, rebuilding his self-concept.

the correct answer is d