In Regard to the Impact of Biological Influences on Eating

In regard to the impact of biological influences on eating disordered behavior

A) exposure to higher testosterone is often implicated.
B) increased hormonal changes at puberty are hypothesized to increase risk.
C) increased serotonin activity has been observed in individuals with anorexia and bulimia.
D) genetic influences are significant in preadolescents but fade through adolescence and adulthood.