Final answer:
Mrs. Sunstedt's approach to parenting is most explicitly recommended by Carl Rogers, a humanistic psychologist who emphasized unconditional positive regard and congruence between the real self and ideal self.
Step-by-step explanation:
Mrs. Sunstedt's approach to parent-child interaction, which emphasizes the acceptance and understanding of children's feelings as well as the honest disclosure of one's own feelings, aligns closely with the theories of humanistic psychologist Carl Rogers. Rogers advocated for unconditional positive regard in parent-child relationships and emphasized the importance of helping children achieve congruence between their real self and ideal self to foster a healthy self-concept. This nurturing of a positive self-concept is considered critical for leading a healthy, productive life.