A young adult is reflecting on key moments that shaped their view of themself. They recall: 1) A feeling of immense pride in elementary school after winning a regional science fair, realizing they were good at something their friends were not. 2) A period in high school spent trying different hobbies and social groups to figure out their personal values and future goals. 3) A vivid early memory of successfully dressing themselves for the first time without help, giving them a sense of independence. Based on the psychosocial framework of self-concept development, which of these experiences was most fundamental to establishing a sense of competence through social comparison?