Nancy has just entered her teenage years. Although she was a good student in elementary, school she recently has gotten into trouble at school because she is behaving inappropriately and she does not seem to be able to control herself well enough to get enough sleep and complete her homework. If Nancy's difficulties are linked to the parenting style of her parents, they would most likely be described as:
a. Regressive parents
b. Authoritarian parents
c. Permissive parents
d. Authoritative parents