Seven-Year-Old Mannie Avoided Walking Carelessly Across a Street with Heavy

Multiple Choice

Seven-year-old Mannie avoided walking carelessly across a street with heavy traffic by telling himself to "stop,look,and listen before crossing." The value of his verbal self-warning for controlling his own behavior was most clearly emphasized by

A) Erik Erikson.
B) Jean Piaget.
C) Lev Vygotsky.
D) Lawrence Kohlberg.