Marcia has started to have difficulty with her nighttime vision, and thus has decided that it is better if she no longer drives after dusk, except in emergency situations. she has asked her friends, with whom she often gets together, if they would mind either (a) getting together at her house more often than normal, or (b) if one of them would mind giving her regular rides to other social events that take place at night. marcia's behaviors best demonstrate which model of human development?