Randolf is a 24-year-old college graduate who was just accepted into medical school. he has just ended a year-long romantic relationship due to concerns about maintaining a long-distance relationship and the demands of medical school. in today's developmental terms, randolf is a(n)

Here the correct answer is emerging adult.

Explanation:

Emerging adulthood is a phase of line ( 18-25 ) which comes in every persons life , like it has in Randolf , where he is trying to decide what is his priorities , what is more important for him , he is trying to explore more possibilities in life, he doesn't want to be constrained by any sort of role requirements, so that's why he thought it was better to end relationship at this point where medical school is his priority and because of it's high demands , he can't continue a long distance relationship.

i would say b. research typically uses a variety of sources