Final answer:
Families with a member who has an eating disorder are often associated with increased disordered eating behaviors, influenced by both environmental and biological factors.
Step-by-step explanation:
Compared to families without a member with an eating disorder, families with people with eating disorders tend to be associated with c) Increased disordered eating behaviors. Environmental factors such as child abuse, tight parental control over eating habits, fragile sense of self-identity, and social isolation can increase the risk of developing eating disorders. Moreover, biological factors including the genetics and dysregulation of neurotransmitters like serotonin and dopamine, as well as the hormones leptin and ghrelin, which are involved in the body's energy homeostasis, also play a significant role.