Why does use of the BMI overestimate the prevalence of obesity in the African-American population

a.Blacks have a higher average height than whites.
b.Blacks have denser bones and higher body protein concentrations than whites.
c.Blacks tend to have different proportions of brown and white adipose tissue than whites.
d.The fat pads in blacks are situated primarily around the hips, whereas in whites the pads are primarily abdominal.
e.Blacks have both lower average height and higher average weight than whites.